WIP: new backup/recovery API

[elsirion]

Working towards #2977

[codecov]

Codecov Report

Attention: 345 lines in your changes are missing coverage. Please review.

Comparison is base (59ca43d) 59.05% compared to head (5a1b038) 58.66%.
Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3008      +/-   ##
==========================================
- Coverage   59.05%   58.66%   -0.40%     
==========================================
  Files         190      191       +1     
  Lines       39990    40341     +351     
==========================================
+ Hits        23617    23665      +48     
- Misses      16373    16676     +303     

Files	Coverage Δ
fedimint-core/src/macros.rs	26.56% <100.00%> (ø)
fedimint-core/src/core.rs	11.15% <0.00%> (ø)
modules/fedimint-mint-client/src/backup.rs	0.00% <0.00%> (ø)
gateway/ln-gateway/src/state_machine/mod.rs	90.69% <0.00%> (-1.51%)	⬇️
modules/fedimint-ln-client/src/lib.rs	86.96% <0.00%> (-0.68%)	⬇️
modules/fedimint-wallet-client/src/lib.rs	86.25% <0.00%> (-1.28%)	⬇️
modules/fedimint-dummy-client/src/lib.rs	86.27% <0.00%> (-2.44%)	⬇️
fedimint-client/src/module/init.rs	72.72% <0.00%> (-10.39%)	⬇️
modules/fedimint-mint-client/src/lib.rs	64.97% <0.00%> (-0.07%)	⬇️
fedimint-client/src/module/mod.rs	39.22% <0.00%> (-3.91%)	⬇️
... and 2 more

... and 12 files with indirect coverage changes

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[elsirion]

Do we need access to the API here?

[elsirion]

Call with @dpc:

• What if one module stalls?
  • Maybe independent recovery
  • Get module should check if recovery is finished
• Keep using state machines, just don't store old states
• Let Client drive recovery, keep track of SMs that are doing recovery
• Separate init fn that return recovery SM