feat(store): use strict projectors for createFeature selectors

[markostanimirovic]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https:/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?

Closes #3740

What is the new behavior?

Projector function arguments of selectors generated by createFeature are strongly typed.

Does this PR introduce a breaking change?

[x] Yes
[ ] No

BREAKING CHANGES:

Projectors of selectors generated by createFeature are strongly typed.

BEFORE:

Projector function arguments of selectors generated by createFeature are not strongly typed:

const counterFeature = createFeature({
  name: 'counter',
  reducer: createReducer({ count: 0 }),
});

counterFeature.selectCount.projector
// type: (...args: any[]) => number

AFTER:

Projector function arguments of selectors generated by createFeature are strongly typed:

const counterFeature = createFeature({
  name: 'counter',
  reducer: createReducer({ count: 0 }),
});

counterFeature.selectCount.projector
// type: (featureState: { count: number; }) => number

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