feat(component): remove ReactiveComponentModule

[markostanimirovic]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/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:

What is the current behavior?

Closes #3623

What is the new behavior?

ReactiveComponentModule is removed.

Does this PR introduce a breaking change?

[x] Yes
[ ] No

BREAKING CHANGES:

ReactiveComponentModule is removed in favor of LetModule and PushModule.

BEFORE:

import { ReactiveComponentModule } from '@ngrx/component';

@NgModule({
  imports: [
    // ... other imports
    ReactiveComponentModule,
  ],
})
export class MyFeatureModule {}

AFTER:

import { LetModule, PushModule } from '@ngrx/component';

@NgModule({
  imports: [
    // ... other imports
    LetModule,
    PushModule,
  ],
})
export class MyFeatureModule {}

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