Fully support Infura and remove all warnings concerning its usage

[LefterisJP]

Fixes: #5217

Description

• Fully supports Infura
• Removes all warnings

PR review check list

Quality check list that cannot be automatically verified.

• Safety
  • The changes respect the necessary conditions for safety (https://raiden-network-specification.readthedocs.io/en/latest/smart_contracts.html#protocol-values-constraints)
• Code quality
  • Error conditions are handled
  • Exceptions are propagated to the correct parent greenlet
  • Exceptions are correctly classified as recoverable or unrecoverable
• Compatibility
  • State changes are forward compatible
  • Transport messages are backwards and forward compatible
• Commits
  • Have good messages
  • Squashed unecessary commits
• If it's a bug fix:
  • Regression test for the bug
    • Properly covers the bug
    • If an integration test is used, it could not be written as a unit test
• Documentation
  • A new CLI flag was introduced, is there documentation that explains usage?
• Specs
  • If this is a protocol change, are the specs updated accordingly? If so, please link PR from the specs repo.
• Is it a user facing feature/bug fix?
  • Changelog entry has been added

[codecov]

Codecov Report

Merging #5221 into develop will decrease coverage by 0.01%.
The diff coverage is 22.72%.

@@            Coverage Diff             @@
##           develop   #5221      +/-   ##
==========================================
- Coverage    80.62%   80.6%   -0.02%     
==========================================
  Files          120     120              
  Lines        14856   14873      +17     
  Branches      2306    2308       +2     
==========================================
+ Hits         11977   11988      +11     
- Misses        2202    2205       +3     
- Partials       677     680       +3

Impacted Files	Coverage Δ
raiden/ui/app.py	26.84% <100%> (+3.71%)	⬆️
raiden/network/rpc/client.py	72.42% <15%> (-3.14%)	⬇️
raiden/tasks.py	67.15% <0%> (-0.73%)	⬇️
raiden/network/transport/matrix/transport.py	79.29% <0%> (-0.46%)	⬇️
raiden/network/proxies/token_network.py	51.15% <0%> (+0.24%)	⬆️
raiden/transfer/node.py	94.7% <0%> (+0.55%)	⬆️
raiden/api/python.py	68.13% <0%> (+0.98%)	⬆️

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[rakanalh]

LGTM. The PR has to be rebased because i changed some nonce related stuff for #4923

[konradkonrad]

lgtm!