Mint: Add clnrest.py Lightning backend

[lollerfirst]

• Implements changes requested in Issue Feature request: add NUT-15 Multinut payments to CLNRestWallet #536
• small improvements of the checks on the same functionality in lndrest
• Ports backend for CLN to the clnrest plugin (no more dependency on external c-lightning-REST!)

[lollerfirst]

I fixed and merged @rbensberg branch which puts corelightningrest.py onto the newer plugin clnrest which comes integrated with CLN and should just work without too many hoops.

Although NOW for some reason it hangs when verifying the payment of the quote (when minting tokens). If you stop it and then check the invoice manually cashu invoice <amount> --id <quote_id> it updates correctly.

Not quite sure what's causing this.

[lollerfirst]

paid_invoices_stream was the problem. Fixed it.

[callebtc]

Thank you for the fixes in lndrest.py. Could you put those changes into a separate PR?

[lollerfirst]

Yea sure.

[codecov]

Codecov Report

Attention: Patch coverage is 11.47541% with 54 lines in your changes missing coverage. Please review.

Project coverage is 64.90%. Comparing base (1766b6e) to head (6716256).
Report is 5 commits behind head on main.

❗ Current head 6716256 differs from pull request most recent head c788b74

Please upload reports for the commit c788b74 to get more accurate results.

Files	Patch %	Lines
cashu/lightning/corelightningrest.py	4.34%	44 Missing ⚠️
cashu/lightning/lndrest.py	16.66%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #551      +/-   ##
==========================================
- Coverage   65.02%   64.90%   -0.12%     
==========================================
  Files          91       91              
  Lines        8065     8147      +82     
==========================================
+ Hits         5244     5288      +44     
- Misses       2821     2859      +38     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.