feat: adds Angular 12 support

[IKatsuba]

BREAKING CHANGE: the minimum Angular version is 12

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] The commit message follows Conventional Commits
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Other... Please describe:

What is the current behavior?

Closes #

What is the new behavior?

Does this PR introduce a breaking change?

• [ ] Yes
• [ ] No

Other information

[tinkoff-bot]

:tada: This pull request is included in version core@4.0.0 :tada:

The release is available on GitHub release

[tinkoff-bot]

:tada: This pull request is included in version browser@4.0.0 :tada:

The release is available on GitHub release

[tinkoff-bot]

:tada: This pull request is included in version angular@4.0.0 :tada:

The release is available on GitHub release