netflow: enrich network direction and type

[efd6]

What does this PR do?

Adds enrich network direction and type.

New test events are from the netflow9_e10s_4_7byte_pad.pcap and ipfix_test_procera_*52935.dat files in the netflow tests from elastic/beats@b6aa375 with adjustment for integration package testing.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes Netflow ingest pipeline doesn't set network.type or network.direction fields #5452

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Build stats

• Start Time: 2023-03-10T06:38:20.899+0000

• Duration: 13 min 30 sec

Test stats 🧪

Test	Results
Failed	0
Passed	14
Skipped	0
Total	14

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.427
Classes	100.0% (1/1)	💚 3.427
Methods	100.0% (8/8)	💚 8.754
Lines	90.909% (80/88)	👎 -0.477
Conditionals	100.0% (0/0)	💚

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

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Package netflow - 2.5.0 containing this change is available at https://epr.elastic.co/search?package=netflow