feat(store): change the StateModule name into State

[profanis]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngxs/store/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] 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?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[nx-cloud]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit 8f5ffe7. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this CI Pipeline Execution

---

✅ Successfully ran 3 targets

• nx run-many --target=test --all --configuration=ci --maxWorkers=4
• nx run-many --target=lint --all
• nx run-many --target=build --all

---

Sent with 💌 from NxCloud.

[bundlemon]

BundleMon (Integration Projects)

Unchanged files (1)

Status	Path	Size	Limits
✅	Main bundles(Gzip) hello-world-ng15/dist-integration/main.(hash) .js	63.35KB	+1%

No change in files bundle size

Final result: ✅

View report in BundleMon website ➡️

---

Current branch size history | Target branch size history

[codeclimate]

Code Climate has analyzed commit 8f5ffe7 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 94.9% (0.0% change).

View more on Code Climate.