feat(store): add `withExperimentalNgxsPendingTasks`

[arturovt]

In this commit, we provide the experimental app stability NGXS contributor as part of the code. This is a fundamental feature that probably shouldn't be included in recipes but should be part of our codebase. It is already being used in production by apps that utilize zoneless server-side rendering. We expose it through the @ngxs/store/experimental subpackage because exposing it from the core package would be a breaking change, as it uses the experimental pending tasks service introduced in Angular 18 (though we remain compatible with Angular 16).

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[bundlemon[bot]]

BundleMon (Integration Projects)

Unchanged files (2)

Status | Path | Size | Limits :------------: | ------------ | :------------: | :------------: :white_check_mark: | Main bundles(Gzip)
_{hello-world-ng17/dist-integration/main.(hash)
.js}
| 69.46KB | +1% :white_check_mark: | Main bundles(Gzip)
_{hello-world-ng16/dist-integration/main.(hash)
.js}
| 68.47KB | +1%

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[codeclimate[bot]]

Code Climate has analyzed commit 9397af78 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 95.4% (0.0% change).

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