use swap id as identifier for connection

[stark-3k]

For the makers in the Taproot protocol, we were still using IP addresses as the key for the swap connection state which was problematic for multiple reasons(simultaneous swaps with two local takers, two connected to the same Tor exit node, etc). This PR updates the code to use swap_id as the key for ConnectionState which solves these issues.

[codecov]

Codecov Report

❌ Patch coverage is 93.50649% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.26%. Comparing base (776b75d) to head (46e9b72).
⚠️ Report is 64 commits behind head on master.

Files with missing lines	Patch %	Lines
src/maker/server2.rs	89.58%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #663      +/-   ##
==========================================
+ Coverage   68.87%   77.26%   +8.38%     
==========================================
  Files          35       49      +14     
  Lines        4932    14462    +9530     
==========================================
+ Hits         3397    11174    +7777     
- Misses       1535     3288    +1753     

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[mojoX911]

Mostly looks good. But needs some changes.

[mojoX911]

Ack.