feat: add command to clear auth token cache

[danielgtaylor]

This adds a basic profile-aware command to clear the auth token cache, so you don't have to try and find the cache.json file, find the right line, and delete it in order to force e.g. OAuth2 re-auth. Now it's a simple:

$ restish api clear-auth-cache $NAME`

Pass --rsh-profile=$PROFILE or -p $PROFILE to clear the cache for a specific profile instead of default.

[codecov]

Codecov Report

Merging #234 (97c3636) into main (21a9017) will increase coverage by 0.02%.
The diff coverage is 84.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #234      +/-   ##
==========================================
+ Coverage   76.84%   76.86%   +0.02%     
==========================================
  Files          26       26              
  Lines        3666     3679      +13     
==========================================
+ Hits         2817     2828      +11     
- Misses        642      643       +1     
- Partials      207      208       +1     

Files	Coverage Δ
cli/apiconfig.go	83.87% <84.61%> (+0.06%)	⬆️

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