refactor(store): pull less RxJS symbols

[arturovt]

In this commit, we reduce the number of imported symbols from RxJS by removing the pairwise()
operator (since users consuming the NGXS library may not use it) and replacing RxJS of()
with a custom function that instantly returns an observable.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit a3f02fd.

Command	Status	Duration	Result
nx run-many --target=lint --all --exclude=creat...	✅ Succeeded	1s	View ↗
nx run-many --target=test --all --configuration...	✅ Succeeded	2s	View ↗
nx lint-types store	✅ Succeeded	<1s	View ↗
nx run-many --target=build --all	✅ Succeeded	2s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-03-10 09:23:52 UTC

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commit: a3f02fd

[codeclimate]

Code Climate has analyzed commit d4b8da5 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 96.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 95.3% (0.0% change).

View more on Code Climate.