fix: span events count limit when set to 0

[Bataran]

Which problem is this PR solving?

If span events count limit (OTEL_SPAN_EVENT_COUNT_LIMIT) is set to 0 there should be no events in the span. Current implementation allows adding 1 event when the limit is set to 0.

Fixes #2670

Short description of the changes

Span's addEvent function updated. If the limit is set to 0, it adds log that no event are allowed and returns.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Unit tests have been added

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Mitar Milanovic (6936ea6)

[codecov]

Codecov Report

Merging #2679 (b6592f6) into main (f010fa3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2679   +/-   ##
=======================================
  Coverage   92.52%   92.53%           
=======================================
  Files         144      144           
  Lines        5180     5183    +3     
  Branches     1103     1104    +1     
=======================================
+ Hits         4793     4796    +3     
  Misses        387      387           

Impacted Files	Coverage Δ
packages/opentelemetry-sdk-trace-base/src/Span.ts	100.00% <100.00%> (ø)