[WIP] Basic support for OTTL in transform processor

[albertlockett]

Status: Work in progress TODO:

• additional tests in OTTL Parser

Also #2797 can merge first and I'll fix the conflicts on this PR after it is merged.

Change Summary

Adds very basic support for OTTL in the transform processor. All it is currently capably of is setting the value of some field to a literal. Example:

version: otel_dataflow/v1
engine: { }
groups:
  default:
    pipelines:
       # ...
        nodes:
          transform:
            type: processor:transform
            config:
              ottl:
                log_statements:
                - set(severity_text, "ERROR")

There is still quite a lot of work to do in the OTTL Parser & Query-Engine support additional capabilities.

What issue does this PR close?

• Part of Support OTTL transform statements in the transform processor #2736

How are these changes tested?

Unit

Are there any user-facing changes?

Yes - OTTL configuration is now available in transform processor.

[codecov]

Codecov Report

❌ Patch coverage is 46.22642% with 114 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.01%. Comparing base (993fa36) to head (c3e0ebf).

❌ Your patch check has failed because the patch coverage (46.22%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2806      +/-   ##
==========================================
- Coverage   86.04%   86.01%   -0.04%     
==========================================
  Files         704      706       +2     
  Lines      263905   264102     +197     
==========================================
+ Hits       227085   227160      +75     
- Misses      36296    36418     +122     
  Partials      524      524              

Components	Coverage Δ
otap-dataflow	86.99% <97.02%> (+<0.01%)	⬆️
query_abstraction	80.61% <ø> (ø)
query_engine	90.51% <0.00%> (-0.26%)	⬇️
otel-arrow-go	52.45% <ø> (ø)
quiver	92.25% <ø> (ø)

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