Remove public agent

[mirgee]

Removes any and all usage of public agents in the codebase. In Rust integration tests where connection bootstrapping was previously performed via a public agent, an alternative approach was temporarily (i.e. until mediated connection is removed) chosen: the connection request message is sent / received via a channel instead of a DidComm endpoint to avoid overhead associated with managing an open TCP socket per test in Rust. However, vcx-agent-core integration tests do exchange connection requests via DidComm endpoint.

[codecov-commenter]

Codecov Report

Merging #715 (aa7210a) into main (e671deb) will increase coverage by 0.17%.
The diff coverage is 73.97%.

@@            Coverage Diff             @@
##             main     #715      +/-   ##
==========================================
+ Coverage   64.16%   64.34%   +0.17%     
==========================================
  Files         246      245       -1     
  Lines       22922    22837      -85     
  Branches     5088     5075      -13     
==========================================
- Hits        14709    14694      -15     
+ Misses       4072     4017      -55     
+ Partials     4141     4126      -15     

Flag	Coverage Δ
unittests-aries-vcx	64.19% <73.97%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aries_vcx/tests/utils/scenarios.rs	80.46% <62.50%> (-0.92%)	⬇️
...vcx/src/handlers/connection/mediated_connection.rs	63.15% <69.56%> (+0.72%)	⬆️
aries_vcx/tests/test_connection.rs	74.64% <83.33%> (+0.37%)	⬆️
aries_vcx/tests/utils/devsetup_agent.rs	73.01% <100.00%> (+0.35%)	⬆️
aries_vcx/src/handlers/connection/cloud_agent.rs	73.96% <0.00%> (+0.59%)	⬆️
aries_vcx/src/common/ledger/transactions.rs	62.67% <0.00%> (+1.05%)	⬆️
... and 2 more

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[Patrik-Stas]

Though still in draft, preliminary approved from my side, looks great!

Just list of changes to the PR, mainly changes to aries-vcx APIs