Allow for metamask: schemed URLs

[hmalik88]

Validation logic has been updated to allow for an Icon to also be included as a Link child. A new URL scheme is also introduced metamask: (see SIP-22), this scheme will allow a snap to navigate to the extension and other snap pages through a metamask: schemed URL.

[codecov]

Codecov Report

Attention: Patch coverage is 98.14815% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.37%. Comparing base (3a7cc20) to head (11bfb5b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ntrollers/src/interface/SnapInterfaceController.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2719      +/-   ##
==========================================
+ Coverage   94.35%   94.37%   +0.01%     
==========================================
  Files         476      477       +1     
  Lines       10139    10183      +44     
  Branches     1542     1555      +13     
==========================================
+ Hits         9567     9610      +43     
- Misses        572      573       +1     

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[ritave]

What happens if there's a <Button form="asd" navigateTo="home" />

[Mrtenz]

Blocking this as this requires further discussion.