feat: allow cloning Api instances

[KnorpelSenf]

This exposes api.token and api.options. This is useful because it lets us create new Api instances from existing ones, optionally reconfiguring them on the fly.

The main use case for this is the second major version of the conversations plugin which no longer shares the same Api instance across context objects—something that was a big hack that mostly worked for v1.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.75%. Comparing base (d62a142) to head (ec542b5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #594      +/-   ##
==========================================
+ Coverage   47.74%   47.75%   +0.01%     
==========================================
  Files          19       19              
  Lines        6177     6179       +2     
  Branches      343      343              
==========================================
+ Hits         2949     2951       +2     
  Misses       3224     3224              
  Partials        4        4              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.