feat(gtk): connect to remote node

[b00f]

Description

This PR defines the grpc-addr and connects the GUI to the remote node.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.34%. Comparing base (86a8ba9) to head (1a1eb21).
⚠️ Report is 296 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2079      +/-   ##
==========================================
- Coverage   75.07%   71.34%   -3.73%     
==========================================
  Files         234      293      +59     
  Lines       12156    18088    +5932     
==========================================
+ Hits         9126    12905    +3779     
- Misses       2582     4654    +2072     
- Partials      448      529      +81     

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