construction of grants and requests are not async

[LiranCohen]

Currently PermissionGrant and PermissionRequest have an async parse() method to instantiate them with a private constructor.

However there is currently no async action needed to parse the grant/request. Any objection to removing the parse() method in favor of just using the constructor?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.69%. Comparing base (39c485c) to head (1c0c8d7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #791      +/-   ##
==========================================
- Coverage   98.69%   98.69%   -0.01%     
==========================================
  Files          73       73              
  Lines       11269    11259      -10     
  Branches     1612     1610       -2     
==========================================
- Hits        11122    11112      -10     
  Misses        141      141              
  Partials        6        6              

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[LiranCohen]

Keeping the pattern of async parse() over constructors.