feat(x/callback): throw events

[spoo-bar]

Throw events on

• registering callback
• cancelling callback
• successful execution of callback
• failure in execution of callback

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (feat/callback-module@15d1314). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feat/callback-module #520 +/- ## ======================================================= Coverage ? 63.85% ======================================================= Files ? 70 Lines ? 4111 Branches ? 0 ======================================================= Hits ? 2625 Misses ? 1357 Partials ? 129 ```

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