fix(entity): set correct return type for getSelectors signature with parent selector

[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?

[x] Bugfix
[ ] 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 #2751, #3172

Does this PR introduce a breaking change?

[x] Yes
[ ] No

BREAKING CHANGES:

Selectors returned by the `adapter.getSelectors` signature that accepts a parent selector are strongly typed.

BEFORE:

const {
  selectIds, // type: (state: object) => string[] | number[]
  selectEntities, // type: (state: object) => Dictionary<Book>
  selectAll, // type: (state: object) => Book[]
  selectTotal, // type: (state: object) => number
} = adapter.getSelectors(selectBooksState);

AFTER:

const {
  selectIds, // type: MemoizedSelector<object, string[] | number[]>
  selectEntities, // type: MemoizedSelector<object, Dictionary<Book>>
  selectAll, // type: MemoizedSelector<object, Book[]>
  selectTotal, // type: MemoizedSelector<object, number>
} = adapter.getSelectors(selectBooksState);

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