[pkg/stanza/adapter] Deprecate Convert helper

[dmitryax]

Convert helper was introduced in #3125, but was never used.

Now we have pkg/stanza/adapter exposed as a public API, it's important to limit its scope.

[runforesight]

Foresight Summary

    
Major Impacts

TestAerospikeIntegration ❌ failed 1 times in 2 runs (50% fail rate).

build-and-test-windows duration(58 seconds) has decreased 43 minutes 35 seconds compared to main branch avg(44 minutes 33 seconds).

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✅  check-links workflow has finished in 13 minutes 21 seconds (⚠️ 10 minutes 39 seconds more than main branch avg.) and finished at 9th Jan, 2023.

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Job	Failed Steps	Tests
changed files	-     🔗	N/A	See Details
check-links	-     🔗	N/A	See Details

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✅  tracegen workflow has finished in 14 minutes 13 seconds (⚠️ 11 minutes 7 seconds more than main branch avg.) and finished at 9th Jan, 2023.

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Job	Failed Steps	Tests
build-dev	-     🔗	N/A	See Details
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✅  prometheus-compliance-tests workflow has finished in 17 minutes 32 seconds (⚠️ 8 minutes 48 seconds more than main branch avg.) and finished at 9th Jan, 2023.

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Job	Failed Steps	Tests
prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

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✅  load-tests workflow has finished in 42 minutes 23 seconds (⚠️ 26 minutes 28 seconds more than main branch avg.) and finished at 9th Jan, 2023.

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loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 19  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details

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⭕  changelog workflow has finished in 58 seconds (8 minutes 30 seconds less than main branch avg.) and finished at 9th Jan, 2023.

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changelog	-     🔗	N/A	See Details

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⭕  build-and-test-windows workflow has finished in 58 seconds (43 minutes 35 seconds less than main branch avg.) and finished at 9th Jan, 2023.

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Job	Failed Steps	Tests
windows-unittest-matrix	-     🔗	N/A	See Details
windows-unittest	-     🔗	N/A	See Details

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 build-and-test workflow has finished in 2 minutes 43 seconds (44 minutes 36 seconds less than main branch avg.) and finished at 9th Jan, 2023.

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Job	Failed Steps	Tests
integration-tests	N/A	✅ 55  ❌ 0  ⏭ 0    🔗	See Details

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[dmitryax]

@djaglowski It'd be nice if we can merge it before releasing 0.68.0. Test coverage for this function has a bunch of Map.Sort which I would like to remove instead of reworking