feat(scope): add last event ID getters

[jpnurmi]

Track the last captured event ID, and expose global and scope-specific getters.

Note

This tracks the last ID of ANY captured event during the current run, including crashes processed from previous runs. This is meant to complement #1985, which provides a callback for previously CRASHED runs.

Close: #1447

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 5050c01

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Codecov Report

❌ Patch coverage is 96.07843% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.32%. Comparing base (0626940) to head (5050c01).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1992   +/-   ##
=======================================
  Coverage   74.32%   74.32%           
=======================================
  Files         104      104           
  Lines       25701    25738   +37     
  Branches     4640     4648    +8     
=======================================
+ Hits        19101    19131   +30     
- Misses       5293     5299    +6     
- Partials     1307     1308    +1     

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