feat(component-store): add selectSignal signature that combines provided signals

[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 new behavior?

A new signature of the selectSignal function is added. It creates a new signal by combining provided signals:

@Injectable()
class UsersStore extends ComponentStore<State> {
  readonly users = this.selectSignal((s) => s.users);
  readonly query = this.selectSignal((s) => s.query);

  readonly filteredUsers = this.selectSignal(
    this.users,
    this.query,
    (users, query) => users.filter((user) => user.name.includes(query))
  );
}

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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[timdeschryver]

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[jits]

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