[Mint] Add support for BTC and EUR in StrikeWallet backend, add EUR to FakeWallet

[callebtc]

This pull request adds support for EUR in the Strike backend. Previously, only USD was supported. With this change, users will be able to use Strike for BTC, USD, and EUR.

• Configuration in .env changes from StrikeUSDWallet to StrikeWallet
• FakeWallet now supports EUR as well
• Invoice listener only for backends that support incoming payment streams
• Invoice listener now restarts on error

[codecov]

Codecov Report

Attention: Patch coverage is 42.55319% with 27 lines in your changes missing coverage. Please review.

Project coverage is 68.72%. Comparing base (3b2f1aa) to head (103cc0a).
Report is 17 commits behind head on main.

❗ Current head 103cc0a differs from pull request most recent head 772fb26

Please upload reports for the commit 772fb26 to get more accurate results.

Files	Patch %	Lines
cashu/core/base.py	25.92%	20 Missing ⚠️
cashu/lightning/strike.py	50.00%	4 Missing ⚠️
cashu/mint/startup.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #561      +/-   ##
==========================================
- Coverage   69.62%   68.72%   -0.90%     
==========================================
  Files          76       91      +15     
  Lines        6913     7965    +1052     
==========================================
+ Hits         4813     5474     +661     
- Misses       2100     2491     +391     

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[daveajones]

Thank you for this. Was just trying to get this working today. 🙏🙏