feat(store): add createFeatureSelector migration

[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?

[ ] 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 #

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Adds a migration to update the deprecated createFeatureSelector syntax:

// BEFORE:

import {createFeatureSelector} from '@ngrx/store'

const featureSelector1 = createFeatureSelector('feature1');
const featureSelector2 = createFeatureSelector<Feature>(feature2);
const featureSelector3 = createFeatureSelector<State, Feature>('feature3');
const featureSelector4 = createFeatureSelector<State,Feature>(feature4);
const featureSelector5 = createFeatureSelector<State,Feature,SomethingElse>(feature5);

// AFTER:

import {createFeatureSelector} from '@ngrx/store'

const featureSelector1 = createFeatureSelector('feature1');
const featureSelector2 = createFeatureSelector<Feature>(feature2);
const featureSelector3 = createFeatureSelector< Feature>('feature3');
const featureSelector4 = createFeatureSelector<Feature>(feature4);
const featureSelector5 = createFeatureSelector<State,Feature,SomethingElse>(feature5);

[ngrxbot]

Preview docs changes for 1d1fef8 at https://previews.ngrx.io/pr3214-1d1fef81/

[markostanimirovic]

Based on the previous migration names:

Suggested change

	"ngrx-store-migration-13-beta": {
	"ngrx-store-migration-04": {

[timdeschryver]

Yea... 😅
The name doesn't really matter (it's only important to run the schematic in the test).
I was thinking it would make more sense to follow the versions, instead of creating an own counter.

[brandonroberts]

@timdeschryver will this handle createFeatureSelector<fromRoot.State, fromFeat.State>('feat'); also?

[timdeschryver]

@brandonroberts that should be covered. I'll add a test later today.

[timdeschryver]

@brandonroberts @markostanimirovic I've added the test in the last commit.