chore: Upgrades react-router to v6

[tuliomir]

This PR upgrades the React Router from version 5.x to v6. Below are the guides followed to implement the necessary adaptations:

• Migration guide from v5 to v6
• Additional explanations on how to compose routes in this new structure ( mainly implemented on refactor: Root screen to functional component #502 )

Acceptance Criteria

• Upgrades the React Router to the latest stable version v6

Notes

• It's still not recommended to store the full navigation object to use on Sagas (link), but changing this approach on our code is beyond the scope of this PR ( additional reading )
• Most of the file changes were due to renaming all instances of useHistory to useNavigate on the screens. These changes are concentrated on the c99a74f commit for easier reviewing

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 98 lines in your changes are missing coverage. Please review.

Project coverage is 9.17%. Comparing base (abb4da2) to head (c7c8dd9).

Files	Patch %	Lines
src/App.js	0.00%	19 Missing ⚠️
src/sagas/wallet.js	0.00%	7 Missing ⚠️
src/components/TokenBar.js	0.00%	4 Missing ⚠️
src/screens/LockedWallet.js	0.00%	4 Missing ⚠️
src/screens/Settings.js	0.00%	4 Missing ⚠️
src/screens/Signin.js	0.00%	4 Missing ⚠️
src/screens/atomic-swap/ProposalList.js	0.00%	4 Missing ⚠️
src/screens/ChoosePassphrase.js	0.00%	3 Missing ⚠️
src/screens/CustomTokens.js	0.00%	3 Missing ⚠️
src/screens/LoadWallet.js	0.00%	3 Missing ⚠️
... and 21 more

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #555      +/-   ##
=========================================
- Coverage    9.18%   9.17%   -0.01%     
=========================================
  Files         113     113              
  Lines        5269    5273       +4     
  Branches      703     703              
=========================================
  Hits          484     484              
- Misses       4117    4121       +4     
  Partials      668     668              

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