feat(config): Span event config controlled through env vars

[cade-conklin]

Links

Example of python agent environment variables
Example of python agent setting Span Event env vars

Details

Issue

The Go Agent does not control sending spans through environment variables

Goals

Allow the Go Agent to control sending spans through environment variables

Implementation

• Added MaxSamplesStored field to Config.SpanEvents
• Added logic to assign values to Config.SpanEvents.MaxSamplesStored and Config.SpanEvents.Enabled via environment variables

How to test

In progress...

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.13%. Comparing base (f3a9aca) to head (4a06568).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1096      +/-   ##
===========================================
+ Coverage    78.09%   78.13%   +0.04%     
===========================================
  Files          159      159              
  Lines        15854    15913      +59     
===========================================
+ Hits         12381    12434      +53     
- Misses        3060     3065       +5     
- Partials       413      414       +1     

see 4 files with indirect coverage changes

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[cade-conklin]

@mirackara I added in this line to allow for control for enabling span events through env vars. Should I add a function for this as well?