[sdk] BatchLogRecordProcessorOptions from env variables

[nikhilbhatia08]

Fixes # (issue)
BatchLogRecordProcessor requires to get the parameters from the env variables and added export_timeout_millis in the options and added a few tests for testing the passing of parameters from the env list.

This pr is on this comment - #2085 (comment)

Changes

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.16%. Comparing base (eb659f5) to head (cea32fd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3687      +/-   ##
==========================================
+ Coverage   90.14%   90.16%   +0.03%     
==========================================
  Files         222      223       +1     
  Lines        7154     7173      +19     
==========================================
+ Hits         6448     6467      +19     
  Misses        706      706              

Files with missing lines	Coverage Δ
sdk/src/logs/batch_log_record_processor_options.cc	100.00% <100.00%> (ø)

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