Track `FIXME`, `TODO`, `XXX` comments in code

[Flouse]

Background

To track the FIXME, TODO, and XXX comments in the synapseweb3/forcerelay repository:

Tasks

FIXME

https://github.com/search?q=repo%3Asynapseweb3%2Fforcerelay+FIXME&type=code

TODO

https://github.com/search?q=repo%3Asynapseweb3%2Fforcerelay+TODO&type=code

XXX

https://github.com/search?q=repo%3Asynapseweb3%2Fforcerelay+XXX&type=code

[blckngm]

• axon monitor: FIXME: here should consider recovering from long-time-crash
• ckb4ibc: FIXME: u32::MAX to search all cells in one action may be a little heavy if cells are too much

And there are too many TODOs. We should implement what's necessary progressively.