Add callback support in send method

[madhavpcm]

Description

Please include a summary of the change, motivation and context.

Testing

Please describe the tests that you ran to verify your changes. Please summarize what did you test and what needs to be tested e.g. deployed and tested helm chart locally.

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

Documentation

Make sure that you have documented corresponding changes in this repository or hypertrace docs repo if required.

[github-actions]

Test Results

0 tests  ±0   0 ✅ ±0   0s ⏱️ ±0s
0 suites ±0   0 💤 ±0 
0 files   ±0   0 ❌ ±0 

Results for commit 2fecdfd. ± Comparison against base commit 76a8dfa.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (76a8dfa) to head (2fecdfd).

Files with missing lines	Patch %	Lines
...race/core/eventstore/kafka/KafkaEventProducer.java	0.00%	21 Missing ⚠️
...ava/org/hypertrace/core/eventstore/SendResult.java	0.00%	11 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #14   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          9      10    +1     
  Lines        187     219   +32     
  Branches       9      11    +2     
=====================================
- Misses       187     219   +32     

Flag	Coverage Δ
unit	0.00% <0.00%> (ø)

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