feat(core): additional tracker modules (#455)

* Corrected DutyDefinitionSet to match Charon implementation

* tracker module and reason.rs with errors

* Step enum and Tracker trait

* step to separate file, tracker handlera similar to deadliner
architecture

* Major issue fixed, async functions in the Tracker trait

* review corrections

* core/tracker: implement duty analysis pipeline

  Ports analyseDutyFailed, analyseParticipation, extractParSigs, and
  all supporting helpers from charon/core/tracker/tracker.go. Replaces
  the TODO in TrackerService::run with the full analyse-on-deadline
  loop.

  Known deviation: fetch errors always map to REASON_BUG_FETCH_ERROR
  because StepError is opaque (Arc<dyn Error>); REASON_FETCH_BN_ERROR
  requires a typed wrapper to detect beacon-node HTTP errors.

* indexmap fix
eth2api: declare indexmap dependency explicitly

  types.rs references indexmap::IndexSet directly but the crate was not
  listed in Cargo.toml. Nix masked this via cached build artifacts;
  clean builds outside nix failed at the pluto-eth2api compile step.

* Analysis, metrics and reporters tracker modules.

* additional tests for reporters

* unused variable

* removed bool flag from DutyFailure

* fixed import

* skipped recreating the hashSet in incl_supported

* todo

* Corrected review comments

* unneeded dependency

* improved tests

* unneeded

* Fixed first two bugs found by claude.

* additional comments

Author: mskrzypkows