feat(signals): rename withEffects to withEventHandlers

[markostanimirovic]

PR Checklist

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• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

Closes #4976

Does this PR introduce a breaking change?

[x] Yes
[ ] No

BREAKING CHANGES:

The withEffects feature from @ngrx/signals/events plugin is renamed to withEffectHandlers.

BEFORE:

import { withEffects } from '@ngrx/signals/events';

export const CounterStore = signalStore(
  withState({ count: 0 }),
  withEffects((store, events = inject(Events)) => ({
    logCount$: events.on(increment).pipe(
      tap(() => console.log(store.count()))
    ),
  }))
);

AFTER:

import { withEventHandlers } from '@ngrx/signals/events';

export const CounterStore = signalStore(
  withState({ count: 0 }),
  withEventHandlers((store, events = inject(Events)) => ({
    logCount$: events.on(increment).pipe(
      tap(() => console.log(store.count()))
    ),
  }))
);

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