Moving cloud SDK attributes to Segments

[chynesNR]

Using this separate PR to discuss the pros and cons of moving the new Cloud SDK attributes out of Transaction metadata. The goal would be to support multiple AWS services per transaction.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 81.45%. Comparing base (55cc8a4) to head (97bc3ec).

Files with missing lines	Patch %	Lines
src/Agent/NewRelic/Agent/Core/Segments/Segment.cs	0.00%	8 Missing ⚠️
.../Agent/NewRelic/Agent/Core/Segments/NoOpSegment.cs	0.00%	3 Missing ⚠️
...gent/Core/Attributes/AttributeDefinitionService.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                          Coverage Diff                           @@
##           feature/invoke-lambda-instrumentation    #2924   +/-   ##
======================================================================
  Coverage                                  81.45%   81.45%           
======================================================================
  Files                                        467      467           
  Lines                                      29723    29727    +4     
  Branches                                    3309     3309           
======================================================================
+ Hits                                       24210    24214    +4     
+ Misses                                      4717     4716    -1     
- Partials                                     796      797    +1     

Flag	Coverage Δ
Agent	82.37% <0.00%> (+<0.01%)	⬆️
Profiler	73.13% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...nt/NewRelic/Agent/Core/Transactions/Transaction.cs	80.73% <ø> (+0.18%)	⬆️
...gent/Core/Attributes/AttributeDefinitionService.cs	94.24% <0.00%> (-0.13%)	⬇️
.../Agent/NewRelic/Agent/Core/Segments/NoOpSegment.cs	10.25% <0.00%> (-0.86%)	⬇️
src/Agent/NewRelic/Agent/Core/Segments/Segment.cs	89.02% <0.00%> (-3.00%)	⬇️

... and 2 files with indirect coverage changes