bark, bark-rest: Add ExitState::Canceled variant

Peterrequested to merge
feature/cancel-exit into master
  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)

Some necessary refactors included here like not keeping every exit in memory.

Summary by CodeRabbit

  • New Features

    • Added exit cancellation support for in-progress unilateral exits.
    • Added a new option to list finished exits alongside live ones.
    • Exits can now be queried as either live or finished, with clearer status visibility.

  • Bug Fixes

    • Canceling an exit now leaves the VTXO spendable for later use.
    • Finished exits are no longer mixed into the default exit list.

  • Breaking Changes

    • Exit status results now include a canceled state and new cancellation-related error responses.
Edited by coderabbit

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