Add before and around hooks

[oriolgual]

Improves the hook system by adding before and around hooks for all status changes and update the naming so it's clear the existing ones run after the status change.

[Copilot]

Pull request overview

This PR expands DataDrip’s lifecycle hook system to support before_* and around_* hooks for status transitions (in addition to renaming the existing hooks to after_* to clarify timing), and refactors run/batch models to centralize hook execution via a new Hookable concern.

Changes:

• Introduces DataDrip::Hookable and integrates it into BackfillRun and BackfillRunBatch to run before/around/after hooks around status transitions/actions.
• Renames hook method conventions from on_* to after_*, and adds before_* / around_* variants in docs and test fixtures.
• Updates specs and documentation to reflect new hook timing and ordering expectations.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
spec/test_app/app/services/hook_handler.rb	Updates test hook handler to implement before/around/after hook methods and record execution sequence.
spec/test_app/app/backfills/add_role_to_employee.rb	Updates test backfill to implement before/around/after hooks and record execution sequence.
spec/lib/data_drip/hook_handler_spec.rb	Updates expectations to after_* naming and adds ordering tests for before/around/after hooks.
spec/backfills/add_role_to_employee_spec.rb	Updates hook naming and asserts before/around/after ordering in sequences.
app/models/data_drip/backfill_run_batch.rb	Includes Hookable, wraps enum bang methods + enqueue/run! actions with hook execution, and refactors hook targeting.
app/models/data_drip/backfill_run.rb	Includes Hookable, wraps enum bang methods + enqueue action with hook execution, adds with_run_hooks, refactors hook targeting.
app/models/concerns/data_drip/hookable.rb	New concern implementing shared hook execution for status changes and action wrappers.
app/jobs/data_drip/dripper.rb	Wraps “running” execution in with_run_hooks(:running) so hooks can wrap the job action.
README.md	Updates hook documentation and examples to the new before/around/after naming and semantics.

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