feat(store): add selectSignal method for interop with Angular Signals

[brandonroberts]

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 #

What is the new behavior?

Introduces the Store.selectSignal() method for returning a signal of the provided selector function

• It accepts a selector function and returns a Signal of its value
• It throws an error when used outside the injection context
  • Underlying issue here is the use of the select operator that uses the lift on the Observable to create a new instance of the Store. This is done outside the injection context, causing the error.
• Docs incoming also

Does this PR introduce a breaking change?

[x] Yes
[ ] No

Other information

Converted almost entire NgRx example-app to use Store.selectSignal() for exploring, but will revert most of it.

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[timdeschryver]

LGTM! 🚀

[markostanimirovic]

It looks much better now! 🤘

[markostanimirovic]

🚀