Add setGenerateJWT method to update JWT generator after initialization

[franco-zalamena-iterable]

Summary

• Add setGenerateJWT method to allow updating the JWT generator function
• Enables re-initialization of JWT generation when outer tokens change

Test plan

• Initialize SDK with JWT, update generateJWT, verify new function is used
• Verify backward compatibility

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.40%. Comparing base (190a168) to head (402a34f).

Files with missing lines	Patch %	Lines
src/authorization/authorization.ts	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #572      +/-   ##
==========================================
- Coverage   74.45%   74.40%   -0.05%     
==========================================
  Files          57       57              
  Lines        2736     2739       +3     
  Branches      798      798              
==========================================
+ Hits         2037     2038       +1     
- Misses        698      700       +2     
  Partials        1        1              

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