add faas.{name,verson} to tx + txmetrics

[stuartnelson3]

Motivation/summary

We want to capture faas.name and faas.version for lambda functions

Checklist

• Update CHANGELOG.asciidoc
• Update package changelog.yml (only if changes to apmpackage have been made)
• Documentation has been updated

How to test these changes

1. Send FaaS transactions to apm-server
2. Check that faas.name and faas.version show up in the transaction documents and transaction metrics

Related issues

closes #7410

[apmmachine]

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• Start Time: 2022-03-02T10:04:33.993+0000

• Duration: 49 min 3 sec

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Total	5671

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[marclop]

LGTM

[marclop]

Actually, can we also add the fields to the transaction that has FaaS fields in testdata/intake-v2/transactions.ndjson?

[marclop]

Last, #7299 will add a new document to the APM Server guide with all the transaction aggregation dimensions documented. We should either update the docs as a follow-up, in this PR or that PR, whichever we prefer.

[marclop]

Verified with BC1:

Applied the following git patch

diff --git a/testdata/intake-v2/transactions.ndjson b/testdata/intake-v2/transactions.ndjson
index b0b84b674..0fa71ed29 100644
--- a/testdata/intake-v2/transactions.ndjson
+++ b/testdata/intake-v2/transactions.ndjson
@@ -3,4 +3,4 @@
 {"transaction": {"id": "4340a8e0df1906ecbfa9", "trace_id": "0acd456789abcdef0123456789abcdef", "name": "GET /api/types","type": "request","duration": 32.592981,"outcome":"success", "result": "success", "timestamp": 1496170407154000, "sampled": true, "span_count": {"started": 17},"context": {"service": {"runtime": {"version": "7.0"}},"page":{"referer":"http://localhost:8000/test/e2e/","url":"http://localhost:8000/test/e2e/general-usecase/"}, "request": {"socket": {"remote_address": "12.53.12.1","encrypted": true},"http_version": "1.1","method": "POST","url": {"protocol": "https:","full": "https://www.example.com/p/a/t/h?query=string#hash","hostname": "www.example.com","port": "8080","pathname": "/p/a/t/h","search": "?query=string","hash": "#hash","raw": "/p/a/t/h?query=string#hash"},"headers": {"user-agent":["Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36","Mozilla Chrome Edge"],"content-type": "text/html","cookie": "c1=v1, c2=v2","some-other-header": "foo","array": ["foo","bar","baz"]},"cookies": {"c1": "v1","c2": "v2"},"env": {"SERVER_SOFTWARE": "nginx","GATEWAY_INTERFACE": "CGI/1.1"},"body": {"str": "hello world","additional": { "foo": {},"bar": 123,"req": "additional information"}}},"response": {"status_code": 200,"headers": {"content-type": "application/json"},"headers_sent": true,"finished": true,"transfer_size":25.8,"encoded_body_size":26.90,"decoded_body_size":29.90}, "user": {"domain": "ldap://abc","id": "99","username": "foo"},"tags": {"organization_uuid": "9f0e9d64-c185-4d21-a6f4-4673ed561ec8", "tag2": 12, "tag3": 12.45, "tag4": false, "tag5": null },"custom": {"my_key": 1,"some_other_value": "foo bar","and_objects": {"foo": ["bar","baz"]},"(": "not a valid regex and that is fine"}}}}
 {"transaction": { "id": "cdef4340a8e0df19", "trace_id": "0acd456789abcdef0123456789abcdef", "type": "request", "duration": 13.980558, "timestamp": 1532976822281000, "sampled": null, "span_count": { "dropped": 55, "started": 436 }, "marks": {"navigationTiming": {"appBeforeBootstrap": 608.9300000000001,"navigationStart": -21},"another_mark": {"some_long": 10,"some_float": 10.0}, "performance": {}}, "context": { "request": { "socket": { "remote_address": "192.0.1", "encrypted": null }, "method": "POST", "headers": { "user-agent": null, "content-type": null, "cookie": null }, "url": { "protocol": null, "full": null, "hostname": null, "port": null, "pathname": null, "search": null, "hash": null, "raw": null } }, "response": { "headers": { "content-type": null } }, "service": {"environment":"testing","name": "service1","node": {"configured_name": "node-ABC"}, "language": {"version": "2.5", "name": "ruby"}, "agent": {"version": "2.2", "name": "elastic-ruby", "ephemeral_id": "justanid"}, "framework": {"version": "5.0", "name": "Rails"}, "version": "2", "runtime": {"version": "2.5", "name": "cruby"}}},"experience":{"cls":1,"fid":2.0,"tbt":3.4,"longtask":{"count":3,"sum":2.5,"max":1}}}}
 {"transaction": { "id": "00xxxxFFaaaa1234", "trace_id": "0123456789abcdef0123456789abcdef", "name": "amqp receive", "parent_id": "abcdefabcdef01234567", "type": "messaging", "duration": 3, "span_count": { "started": 1 }, "context": {"message": {"queue": { "name": "new_users"}, "age":{ "ms": 1577958057123}, "headers": {"user_id": "1ax3", "involved_services": ["user", "auth"]}, "body": "user created", "routing_key": "user-created-transaction"}},"session":{"id":"sunday","sequence":123}}}
-{"transaction": { "name": "july-2021-delete-after-july-31", "type": "lambda", "result": "success", "id": "142e61450efb8574", "trace_id": "eb56529a1f461c5e7e2f66ecb075e983", "subtype": null, "action": null, "duration": 38.853, "timestamp": 1631736666365048, "sampled": true, "context": { "cloud": { "origin": { "account": { "id": "abc123" }, "provider": "aws", "region": "us-east-1", "service": { "name": "serviceName" } } }, "service": { "origin": { "id": "abc123", "name": "service-name", "version": "1.0" } }, "user": {}, "tags": {}, "custom": { } }, "sync": true, "span_count": { "started": 0 }, "outcome": "unknown", "faas": { "name": "faasName", "version": "1.0.0", "coldstart": false, "execution": "2e13b309-23e1-417f-8bf7-074fc96bc683", "trigger": { "request_id": "FuH2Cir_vHcEMUA=", "type": "http" } }, "sample_rate": 1 } }
+{"transaction": { "name": "july-2021-delete-after-july-31", "type": "lambda", "result": "success", "id": "142e61450efb8574", "trace_id": "eb56529a1f461c5e7e2f66ecb075e983", "subtype": null, "action": null, "duration": 38.853, "timestamp": 1631736666365048, "sampled": true, "context": { "cloud": { "origin": { "account": { "id": "abc123" }, "provider": "aws", "region": "us-east-1", "service": { "name": "serviceName" } } }, "service": { "origin": { "id": "abc123", "name": "service-name", "version": "1.0" } }, "user": {}, "tags": {}, "custom": { } }, "sync": true, "span_count": { "started": 0 }, "outcome": "unknown", "faas": {"id": "aws", "name": "name", "version": "1.0.0", "coldstart": false, "execution": "2e13b309-23e1-417f-8bf7-074fc96bc683", "trigger": { "request_id": "FuH2Cir_vHcEMUA=", "type": "http" } }, "sample_rate": 1 } }

$ curl -H "Content-type: application/x-ndjson" --data-binary @testdata/intake-v2/transactions.ndjson http://localhost:8200/intake/v2/events

Verified that faas.name and faas.version appears up in the metrics document.