Validate that initial permissions type matches validation struct

[Mrtenz]

By using Superstruct's Describe type, we can validate that a struct is assignable to a type. In this case, we make sure that the validation struct in snaps-utils matches the type in snaps-sdk. I had to make a small change to the type to get validation to pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.60%. Comparing base (081b0f7) to head (3f259c2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2293   +/-   ##
=======================================
  Coverage   96.60%   96.60%           
=======================================
  Files         337      337           
  Lines        7629     7630    +1     
  Branches     1186     1186           
=======================================
+ Hits         7370     7371    +1     
  Misses        259      259           

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