refactor(sdk-metrics)!: replace MetricsAttributes with Attributes

[david-luna]

Which problem is this PR solving?

Replaces MetricsAttributes with Attributes

Refs #4175

Short description of the changes

Replace the interfaces in sources & tests. This PR targeting next since the changes in exported APIs make it a breaking change.

How Has This Been Tested?

at the root folder

• npm run compile
• npm run test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.96%. Comparing base (32564ad) to head (b997967).
Report is 3 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #5020   +/-   ##
=======================================
  Coverage   93.96%   93.96%           
=======================================
  Files         310      310           
  Lines        8147     8147           
  Branches     1630     1630           
=======================================
  Hits         7655     7655           
  Misses        492      492           

Files with missing lines	Coverage Δ
packages/sdk-metrics/src/Instruments.ts	96.00% <100.00%> (ø)
packages/sdk-metrics/src/ObservableResult.ts	100.00% <100.00%> (ø)
packages/sdk-metrics/src/aggregator/types.ts	100.00% <ø> (ø)
...xemplar/AlignedHistogramBucketExemplarReservoir.ts	92.30% <ø> (ø)
...metrics/src/exemplar/AlwaysSampleExemplarFilter.ts	100.00% <ø> (ø)
...ages/sdk-metrics/src/exemplar/ExemplarReservoir.ts	95.65% <100.00%> (ø)
...-metrics/src/exemplar/NeverSampleExemplarFilter.ts	100.00% <ø> (ø)
...s/src/exemplar/SimpleFixedSizeExemplarReservoir.ts	77.77% <ø> (ø)
...dk-metrics/src/exemplar/WithTraceExemplarFilter.ts	100.00% <ø> (ø)
packages/sdk-metrics/src/export/MetricData.ts	100.00% <ø> (ø)
... and 5 more

[david-luna]

actually this can target main as commented in #4175 (comment)

new PR: #5021