add dispute metrics, some chores (#3842)

* rename: MsgFilter -> MessageInterceptor

* feat: add dispute metrics

* fixup

* test fixins

* fix metrics

* dummysubsystem export and trait fn fix

* chore: fmt

* undo unwanted changes

* foo

* pfmt

* fixup

* fixup

* revert

* some more

* Update node/malus/Cargo.toml

Co-authored-by: Andronik Ordian <[email protected]>

* Update node/core/dispute-coordinator/src/metrics.rs

Co-authored-by: Andronik Ordian <[email protected]>

* Update node/core/dispute-coordinator/src/metrics.rs

Co-authored-by: Andronik Ordian <[email protected]>

* Update node/core/dispute-coordinator/src/metrics.rs

Co-authored-by: Andronik Ordian <[email protected]>

* add license header

* fix lockfile

* new with opts

* fmt

* Update node/core/dispute-coordinator/src/metrics.rs

* feature gate

Co-authored-by: Andronik Ordian <[email protected]>