Metrics refactor

[bryce-b]

- changed builder structs to classes
- removed unused classes
- filled out noops
- tests

[codecov]

Codecov Report

Patch coverage: 57.14% and project coverage change: +4.92 🎉

Comparison is base (0b1a4dd) 61.26% compared to head (fcd27fd) 66.18%.

❗ Current head fcd27fd differs from pull request most recent head 16ce172. Consider uploading reports for the commit 16ce172 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #432      +/-   ##
==========================================
+ Coverage   61.26%   66.18%   +4.92%     
==========================================
  Files         335      330       -5     
  Lines       14029    14042      +13     
==========================================
+ Hits         8595     9294     +699     
+ Misses       5434     4748     -686     

Impacted Files	Coverage Δ
...es/OpenTelemetrySdk/Logs/LogRecordBuilderSdk.swift	100.00% <ø> (ø)
.../Metrics/Stable/DoubleCounterMeterBuilderSdk.swift	0.00% <ø> (ø)
...etrics/Stable/DoubleHistogramMeterBuilderSdk.swift	80.00% <ø> (+80.00%)	⬆️
...Metrics/Stable/DoubleUpDownCounterBuilderSdk.swift	0.00% <0.00%> (ø)
...trySdk/Metrics/Stable/DoubleUpDownCounterSdk.swift	0.00% <0.00%> (ø)
...table/Exporter/StablePeriodicMetricReaderSdk.swift	69.49% <0.00%> (+69.49%)	⬆️
...s/OpenTelemetrySdk/Metrics/Stable/Instrument.swift	0.00% <ø> (ø)
...Sdk/Metrics/Stable/InstrumentSelectorBuilder.swift	100.00% <ø> (+100.00%)	⬆️
...emetrySdk/Metrics/Stable/LongGaugeBuilderSdk.swift	0.00% <0.00%> (ø)
.../Metrics/Stable/LongHistogramMeterBuilderSdk.swift	0.00% <ø> (ø)
... and 15 more

... and 35 files with indirect coverage changes

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