[IOCOM-2009] FIMS RP page close link

[Vangaorth]

Short description

This PR adds the "Close" button the the example authenticated Relying Party's web page.

List of changes proposed in this pull request

• link (and button) that closes the InApp Browser using the iossoapi protocol

How to test

Using the related IO App branch, check that the In App browser is closed correctly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.85%. Comparing base (566ed24) to head (2b11f4f).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #443    +/-   ##
========================================
  Coverage   63.85%   63.85%            
========================================
  Files         167      167            
  Lines        5437     5437            
  Branches      746      769    +23     
========================================
  Hits         3472     3472            
+ Misses       1964     1820   -144     
- Partials        1      145   +144     

Files with missing lines	Coverage Δ
src/features/fims/services/relyingPartyService.ts	11.94% <ø> (ø)

... and 33 files with indirect coverage changes

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[adelloste]

LGTM