feat: dummypay connector

[darkmatterpool]

This introduces a dummypay that can be used for testing the system end-to-end. It periodically generates the -in and -out payments that simulate a real connector's load or 'conditions'.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@1963c75). Click here to learn what that means.
The diff coverage is 66.54%.

@@           Coverage Diff           @@
##             main      #43   +/-   ##
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  Coverage        ?   32.23%           
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  Files           ?       49           
  Lines           ?     2733           
  Branches        ?        0           
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  Hits            ?      881           
  Misses          ?     1767           
  Partials        ?       85           

Impacted Files	Coverage Δ
cmd/server.go	0.00% <ø> (ø)
pkg/bridge/integration/loader.go	79.41% <0.00%> (ø)
pkg/bridge/connectors/dummypay/task_read_files.go	41.66% <41.66%> (ø)
pkg/bridge/connectors/dummypay/remove_files.go	42.85% <42.85%> (ø)
pkg/bridge/connectors/dummypay/task_ingest.go	48.78% <48.78%> (ø)
pkg/bridge/connectors/dummypay/connector.go	67.85% <67.85%> (ø)
pkg/bridge/connectors/dummypay/task_descriptor.go	72.72% <72.72%> (ø)
...g/bridge/connectors/dummypay/task_generate_file.go	74.00% <74.00%> (ø)
pkg/bridge/connectors/dummypay/config.go	100.00% <100.00%> (ø)
pkg/bridge/connectors/dummypay/fs.go	100.00% <100.00%> (ø)
... and 1 more

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[antoinegelloz]

lgtm :)