Add compliance tests for environment variables

[yuktea]

Added integration tests to verify compliance with the specification matrix.
Covers:

OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT
OTEL_SPAN_EVENT_COUNT_LIMIT
OTEL_SPAN_LINK_COUNT_LIMIT
OTEL_EVENT_ATTRIBUTE_COUNT_LIMIT
OTEL_LINK_ATTRIBUTE_COUNT_LIMIT

[codecov]

Codecov Report

Merging #648 (1e03a15) into main (ca05f51) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #648   +/-   ##
=========================================
  Coverage     84.45%   84.45%           
  Complexity     1141     1141           
=========================================
  Files           127      127           
  Lines          2766     2766           
=========================================
  Hits           2336     2336           
  Misses          430      430           

Flag	Coverage Δ
7.4	84.40% <ø> (ø)
8.0	84.45% <ø> (ø)
8.1	84.45% <ø> (ø)

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