Mint: table locks

[callebtc]

Move all lock states from memory into the database which will enable nutshell to run on multiple instances.

• Migrate from sqlalchemy 1.3 to 1.4
• Remove psycopg2, use asyncpg
• Use connection pools and sessions
• Database locks for individual rows (postgres)
• MintQuote and MeltQuote objects have a pending state in the db now
• Tests properly dispose of their db connections
• Remove pending state in MintQuotes (NUT-04: add new state enum, deprecate paid nuts#141)
• Various fixed

[codecov]

Codecov Report

Attention: Patch coverage is 88.42365% with 47 lines in your changes missing coverage. Please review.

Project coverage is 64.97%. Comparing base (af636db) to head (f2ba89c).

Files	Patch %	Lines
cashu/mint/db/write.py	87.20%	11 Missing ⚠️
cashu/mint/crud.py	66.66%	10 Missing ⚠️
cashu/mint/ledger.py	77.77%	8 Missing ⚠️
cashu/core/db.py	94.26%	7 Missing ⚠️
cashu/lightning/fake.py	40.00%	6 Missing ⚠️
cashu/core/base.py	71.42%	2 Missing ⚠️
cashu/mint/encrypt.py	0.00%	1 Missing ⚠️
cashu/mint/migrations.py	93.75%	1 Missing ⚠️
cashu/wallet/wallet.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #566      +/-   ##
==========================================
+ Coverage   60.41%   64.97%   +4.56%     
==========================================
  Files          92       92              
  Lines        8318     8449     +131     
==========================================
+ Hits         5025     5490     +465     
+ Misses       3293     2959     -334     

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