feat(signals): add delegatedSignal

[markostanimirovic]

PR Checklist

Please check if your PR fulfills the following requirements:

• 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:

What is the current behavior?

Closes #5121

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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[timdeschryver]

LGTM.
To also include this in the API docs you should run collect-docs, I'm thinking about creating an issue to look into automating this because it's often forgotten.

[rainerhahnekamp]

I left one comment for the docs. feel free to commit or skip. Otherwise all good for me!

[michael-small]

Sorry to dig this up, but I imagine it may be overkill to make this a whole issue:

Was it intended for the doc page to be live already? https://ngrx.io/guide/signals/delegated-signal