feat: exponential backoff for retries and permit cancelling bot.init

[KnorpelSenf]

Makes sure that bot.init does not retry too fast.

Allows passing an AbortSignal to bot.init so the initialization process can be cancelled anytime.

Makes sure that calling bot.stop will abort any pending initialization.

Makes sure that polling does not start if the bot is stopped while the onStart callback is running.

Closes #291.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.35 ⚠️

Comparison is base (59c5379) 36.65% compared to head (5938a95) 36.31%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #377      +/-   ##
==========================================
- Coverage   36.65%   36.31%   -0.35%     
==========================================
  Files          18       18              
  Lines        4602     4646      +44     
  Branches      166      166              
==========================================
  Hits         1687     1687              
- Misses       2913     2957      +44     
  Partials        2        2              

Impacted Files	Coverage Δ
src/bot.ts	15.45% <0.00%> (-2.50%)	⬇️

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