feat: add option to filter issues by developer

[jamacku]

storypointer -d <developer>

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 1.17%. Comparing base (10eed02) to head (296e39a).

Files	Patch %	Lines
src/jira.ts	0.00%	8 Missing ⚠️
src/main.ts	0.00%	7 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #16      +/-   ##
========================================
- Coverage   1.21%   1.17%   -0.04%     
========================================
  Files          4       4              
  Lines        330     340      +10     
  Branches       4       4              
========================================
  Hits           4       4              
- Misses       323     333      +10     
  Partials       3       3              

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