feature added setLabel methods to Span, Transaction of public api

[videnkz]

closes #1446

[ghost]

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Build stats

• Build Cause: [Started by user eyalkoren, Replayed #7]

• Start Time: 2020-11-09T14:06:39.357+0000

• Duration: 44 min 13 sec

Test stats 🧪

Test	Results
Failed	0
Passed	1617
Skipped	12
Total	1629

[SylvainJuge]

LGTM, I just have one question regarding the @since javadoc tag value.

[felixbarny]

The APM getting started docs also mention addLabel so they need to be updated as well: https://www.elastic.co/guide/en/apm/get-started/current/metadata.html#labels-fields

[codecov-io]

Codecov Report

Merging #1449 (bd0ecc7) into master (f4ba580) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1449      +/-   ##
============================================
- Coverage     59.28%   59.26%   -0.03%     
- Complexity       92     2716    +2624     
============================================
  Files           392      392              
  Lines         17626    17626              
  Branches       2443     2443              
============================================
- Hits          10450    10446       -4     
- Misses         6461     6464       +3     
- Partials        715      716       +1     

Impacted Files	Coverage Δ	Complexity Δ
...ic/apm/agent/profiler/collections/LongHashSet.java	15.87% <0.00%> (-1.59%)	0.00% <0.00%> (ø%)

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