feat: add sign_out() scope option

[silentworks]

What kind of change does this PR introduce?

Adds the scope option to the sign_out method which can be used to control which sessions should be signed out of the account.

Closes #371

What is the current behavior?

Only supports global scope

What is the new behavior?

Supports global, local and others scope.

Additional context

supabase/auth#1112
supabase/auth-js#713

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (1440dd6) 45.30% compared to head (34a3ddf) 45.33%.

Files	Patch %	Lines
gotrue/_async/gotrue_client.py	20.00%	4 Missing ⚠️
gotrue/_sync/gotrue_client.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #381      +/-   ##
==========================================
+ Coverage   45.30%   45.33%   +0.03%     
==========================================
  Files          23       23              
  Lines        1958     1963       +5     
==========================================
+ Hits          887      890       +3     
- Misses       1071     1073       +2     

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