Flow-based MetaLocker ledger

[sequel21]

This PR implements the MetaLocker ledger protocol on Flow blockchain.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 53.94089% with 561 lines in your changes missing coverage. Please review.

Project coverage is 39.63%. Comparing base (82dcab4) to head (5725bbb).

Files with missing lines	Patch %	Lines
ledger/onflow/ledger.go	43.31%	359 Missing and 52 partials ⚠️
model/record.go	70.54%	26 Missing and 12 partials ⚠️
sdk/testbase/environment.go	23.80%	32 Missing ⚠️
ledger/onflow/types.go	78.62%	22 Missing and 9 partials ⚠️
ledger/onflow/emulator/inmemory.go	85.48%	9 Missing ⚠️
ledger/onflow/cachedb.go	50.00%	4 Missing and 2 partials ⚠️
model/scanner/scanner.go	57.14%	6 Missing ⚠️
utils/bolt.go	50.00%	4 Missing and 2 partials ⚠️
ledger/local/ledger.go	72.22%	2 Missing and 3 partials ⚠️
cmd/metalo/operations/export_ledger.go	0.00%	3 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   39.10%   39.63%   +0.52%     
==========================================
  Files         194      200       +6     
  Lines       19591    20610    +1019     
==========================================
+ Hits         7662     8168     +506     
- Misses      10943    11386     +443     
- Partials      986     1056      +70     

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