fix(store): improve types for string selectors

[timdeschryver]

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?

[x] 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?

Closes #

The string selectors don't have the correct types:

• Does not infer correctly, it will always(?) infer to any

books = this.store.select('books')

• Are not type safe

books = this.store.select('books', 'notExistingState')

What is the new behavior?

The new behavior will infer correctly and will throw errors if the state property is missing.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Similar PRs:

• fix(store): fix typing for select operator #2170
• fix(store): ensure type-safety of select() #2074

/cc @alex-okrushko

[ngrxbot]

Preview docs changes for 89dd230 at https://previews.ngrx.io/pr2174-89dd230/

[alex-okrushko]

Looks like router_store needs some typing cleanup :-/

[timdeschryver]

@macjohnny fyi, we decided to improve the typings