deprecate(rules-engine): actionHandlers will become protected in v13

[matthieu-crouzet]

Proposed change

It's not a good practice to expose a Set.
I added a method registerActionHandlers to replace the usage of actionHandlers.add(...).
It will be future proof if we want to do something else when an action handler is registered.

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Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 71.03%. Comparing base (1dbf243) to head (7a22714).
Report is 4 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...src/services/runner/rules-engine.runner.service.ts	0.00%	4 Missing ⚠️

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