feat: add support for Otel semantic conventions for JVM metrics

[kruskall]

Motivation/summary

Handle new metrics properly:

• 'type' was previously called 'area'
• 'name' includes what was previously called 'type'

See https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/semantic_conventions/runtime-environment-metrics.md#jvm-metrics

Checklist

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

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

Related issues

Closes #8042

[mergify]

This pull request does not have a backport label. Could you fix it @kruskall? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-7.x is the label to automatically backport to the 7.x branch.
• backport-7./d is the label to automatically backport to the 7./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[apmmachine]

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• Start Time: 2022-08-11T19:10:36.573+0000

• Duration: 25 min 44 sec

Test stats 🧪

Test	Results
Failed	0
Passed	137
Skipped	1
Total	138

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[apmmachine]

📚 Go benchmark report

Diff with the main branch

name                                                            old time/op    new time/op    delta
pkg:github.com/elastic/apm-server/internal/agentcfg goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/decoder goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/model/modelindexer goos:linux goarch:amd64
ModelIndexer/NoCompression-12                                     1.73µs ±21%    1.16µs ±18%  -33.13%  (p=0.008 n=5+5)
pkg:github.com/elastic/apm-server/internal/processor/stream goos:linux goarch:amd64
BackendProcessor-12                                               0.00ns ±24%    0.00ns ±49%  -49.38%  (p=0.008 n=5+5)
RUMV3Processor-12                                                 0.00ns ±20%    0.00ns ±31%  -59.98%  (p=0.008 n=5+5)
BackendProcessorParallel/BenchmarkBackendProcessorParallel0-12    0.00ns ±33%    0.00ns ±58%  -39.23%  (p=0.024 n=5+5)
pkg:github.com/elastic/apm-server/internal/publish goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/spanmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/txmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling/eventstorage goos:linux goarch:amd64
ReadEvents/json_codec_big_tx/199_events-12                        1.69ms ± 6%    1.64ms ± 1%   -3.18%  (p=0.016 n=5+5)
ReadEvents/nop_codec_big_tx/10_events-12                          16.7µs ±37%    31.5µs ±34%  +88.32%  (p=0.032 n=5+5)
IsTraceSampled/unsampled-12                                       78.3ns ± 1%    76.3ns ± 2%   -2.58%  (p=0.032 n=5+5)
IsTraceSampled/unknown-12                                          369ns ± 1%     353ns ± 2%   -4.17%  (p=0.008 n=5+5)

name                                                            old alloc/op   new alloc/op   delta
pkg:github.com/elastic/apm-server/internal/agentcfg goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/decoder goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/model/modelindexer goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/processor/stream goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/publish goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/spanmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/txmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling/eventstorage goos:linux goarch:amd64
ReadEvents/json_codec/1000_events-12                              3.19MB ± 0%    3.23MB ± 0%   +1.18%  (p=0.016 n=4+5)

name                                                            old allocs/op  new allocs/op  delta
pkg:github.com/elastic/apm-server/internal/agentcfg goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/decoder goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/model/modelindexer goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/processor/stream goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/publish goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/spanmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/txmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling/eventstorage goos:linux goarch:amd64

report generated with https://pkg.go.dev/golang.org/x/perf/cmd/benchstat

[axw]

LGTM, thanks!