feat(Store): add META_REDUCERS replacement 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?

Users can provide meta reducers with META_REDUCERS

Closes #

What is the new behavior?

Users can provide meta reducers with USER_PROVIDED_META_REDUCERS

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

This migration will replace all META_REDUCERS occurrences to USER_PROVIDED_META_REDUCERS on ng update - this breaking change was introduced in #1613.

[timdeschryver]

I think the implementation of the linter is finished, I just don't know if also have to add a updatePackage rule in the migration.

[brandonroberts]

An updatePackage rule for @ngrx/store?

[timdeschryver]

Yes, mainly for @ngrx/store to upgrade it to version 8.
If I'm not mistaken, it isn't needed for the other packages - they will be automatically updated? But I don't know if that's the case for @ngrx/store since we're proving a migration with this PR.

[ngrxbot]

Preview docs changes for fbfbbd1 at https://previews.ngrx.io/pr1640-fbfbbd1/