GH-3344 added warning and deprecation mechanism

[DmitryBespalov]

Handles #3344

Changes proposed in this pull request:

• Deprecation warning inside the "Connect to web" screen
• Badge that is opened when there are keys and the banner not seen yet
• Support for Firebase remote config parameter to disable the feature

[codecov-commenter]

Codecov Report

Merging #3348 (58dd64b) into main (8197b41) will decrease coverage by 0.62%. Report is 1852 commits behind head on main. The diff coverage is 0.53%.

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@@           Coverage Diff            @@
##            main   #3348      +/-   ##
========================================
- Coverage   8.75%   8.14%   -0.62%     
========================================
  Files        620     786     +166     
  Lines      31233   43377   +12144     
========================================
+ Hits        2733    3531     +798     
- Misses     28500   39846   +11346     

Files	Coverage Δ
Multisig/App/AppDelegate+Messaging.swift	0.00% <0.00%> (ø)
Multisig/App/AppDelegate.swift	0.00% <0.00%> (ø)
Multisig/App/RemoteNotificationHandler.swift	7.90% <1.66%> (-11.66%)	:arrow_down:
Multisig/App/SceneDelegate.swift	0.00% <0.00%> (-52.71%)	:arrow_down:

... and 471 files with indirect coverage changes