Mint: Fakewallet support for USD

[callebtc]

• Add 'usd' support for FakeWallet
• Fix: After a receive, print balance in the unit of the received token in Wallet CLI, not in the default wallet unit.

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 36 lines in your changes are missing coverage. Please review.

Project coverage is 68.42%. Comparing base (f462134) to head (d7b52fc).

Files	Patch %	Lines
cashu/lightning/fake.py	43.47%	13 Missing ⚠️
cashu/mint/startup.py	0.00%	13 Missing ⚠️
cashu/wallet/cli/cli.py	57.14%	6 Missing ⚠️
cashu/lightning/strike.py	50.00%	2 Missing ⚠️
cashu/lightning/__init__.py	50.00%	1 Missing ⚠️
cashu/lightning/base.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #488      +/-   ##
==========================================
- Coverage   68.49%   68.42%   -0.08%     
==========================================
  Files          74       74              
  Lines        6707     6758      +51     
==========================================
+ Hits         4594     4624      +30     
- Misses       2113     2134      +21     

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