feat(store): Expand createReducer type signature to support up to ten action creators

[MikeRyanDev]

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?

Current type signature only supports type inference for up to three action creators

What is the new behavior?

This expands the type signature to support up to ten action creators. Highest I have internally is 7 so 10 felt like a good ceiling for now.

Does this PR introduce a breaking change?

[ ] Yes
[X] No

Other information

[ngrxbot]

Preview docs changes for 63359c5 at https://previews.ngrx.io/pr1803-63359c5/

[ngrxbot]

Preview docs changes for 87cd089 at https://previews.ngrx.io/pr1803-87cd089/