feat(routerStore): add v8 migration schematic

[timdeschryver]

PR Checklist

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• 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?

Add a schematic for the breaking change introduced in #1672.
Replace StoreRouterConnectingModule with StoreRouterConnectingModule.forRoot().

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Extract createReplaceChange and createChangeRecorder to schematics-core and refactor the store schematics.

[brandonroberts]

Will there be additional instructions needed for running these migrations? Something like

ng update @ngrx/router-store --migrate-only --from 7 --to 8

[timdeschryver]

It should be sufficient with ng update @ngrx/store.
I'm not 100% sure of it and wanted to try it if we have a beta version.
I ran it via verdaccio locally, it picks up the migration file but it doesn't seem to execute the migration - I'm not sure if this is because of verdaccio or not since the schematic does work during the tests.

[brandonroberts]

Hopefully we can cut a beta next week and test it with that.

[brandonroberts]

TIL: angular/angular#29735

[ngrxbot]

Preview docs changes for aeb26c0 at https://previews.ngrx.io/pr1699-aeb26c0/

[ngrxbot]

Preview docs changes for c29249e at https://previews.ngrx.io/pr1699-c29249e/