Refactor FFCAPI to a local API interace, and FFTM to a utility package

[peterbroadhurst]

This is quite a big change.

• Removes the Docker build from this package - this means the existing builds will stay for those using them
• Reinstates the FFCAPI definition here, which was recently moved to FF common, and now removed in Remove FFCAPI for updated architecture firefly-common#15
• Refactors the FFCAPI to be a local interface, rather than remote
  • This is because it's just too complex to having the potential of state mismatch in event state between the FFCAPI and the FFTM, and build a clean interface
• Removes the fftm and cmd directories
• Moves the internal/manager to be pkg/fftm for use by FFCAPI connectors
  • They will inject their implementation into the fftm.Manager to start their server

[peterbroadhurst]

Moving to draft until we have confirmed correct operation with the latest alpha code and the old FFTM codestream

[codecov-commenter]

Codecov Report

Merging #7 (b9bae85) into main (9ab5b7a) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              main       #7      +/-   ##
===========================================
- Coverage   100.00%   99.89%   -0.11%     
===========================================
  Files           15       47      +32     
  Lines         1045     2820    +1775     
===========================================
+ Hits          1045     2817    +1772     
- Misses           0        2       +2     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
pkg/policyengines/simple/simple_policy_engine.go	97.47% <ø> (ø)
internal/blocklistener/blocklistener.go	100.00% <100.00%> (ø)
internal/confirmations/confirmations.go	100.00% <100.00%> (ø)
internal/events/eventstream.go	100.00% <100.00%> (ø)
internal/events/listener.go	100.00% <100.00%> (ø)
internal/events/webhooks.go	100.00% <100.00%> (ø)
internal/events/websockets.go	100.00% <100.00%> (ø)
internal/persistence/leveldb_persistence.go	100.00% <100.00%> (ø)
internal/tmconfig/tmconfig.go	100.00% <100.00%> (ø)
internal/ws/wsconn.go	100.00% <100.00%> (ø)
... and 38 more

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[nguyer]

Having been keeping up with changes as they are merged or committed to this branch, and having done extensive testing on it, I think this is stable enough for a merge to main now.