iOS Anytype make unknowndata equatable

[nancywu1]

reopening because last one had unsigned commits

Should be able to return true when asserting two unknown data AnyTypes
fix for getting XCTAssertEqual failed: ("unknownData") is not equal to ("unknownData")

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.24%. Comparing base (32ceef1) to head (fb1027d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #654   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files         333      333           
  Lines       20604    20606    +2     
  Branches     1992     1992           
=======================================
+ Hits        18594    18596    +2     
  Misses       1994     1994           
  Partials       16       16           

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