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, not crashes from previous runs. This is meant to complement #1985, which provides 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 efc358b

[codecov]

Codecov Report

❌ Patch coverage is 96.49123% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.39%. Comparing base (231cb89) to head (efc358b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1992      +/-   ##
==========================================
+ Coverage   74.33%   74.39%   +0.05%     
==========================================
  Files         104      104              
  Lines       25637    25670      +33     
  Branches     4627     4635       +8     
==========================================
+ Hits        19058    19097      +39     
+ Misses       5274     5259      -15     
- Partials     1305     1314       +9     

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