feat(effects): add FEATURE_EFFECTS_INIT lifecycle action

[netoctone]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/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?

Currently, when app needs to wait for feature effects readiness, it can only use OnInitEffects.
If the app has a lot of feature effects and needs to wait for a group of them to be ready, it would require to add OnInitEffects on each effect in the group. And then to listen to all of the actions dispatched by each OnInitEffects.
This would be a lot of boilerplate and this kind of init logic would be pretty fragile.

What is the new behavior?

FEATURE_EFFECTS_INIT action is dispatched after all feature effects are added.
In similar fashion to existing ROOT_EFFECTS_INIT.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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[anjana-gururaj]

Much needed feature. Thanks!