Schematics: Add schematics for effect creators

[brandonroberts]

Follow up to #1667

1. Adds an effectCreators option to the effect, and feature schematics that uses the new effect creator function instead of decorators
2. The effectCreators flag will use a different set of files for scaffolding. This keeps our current structure with files intact.
3. Adds tests to verify the behavior of the previously mentioned schematics

[itayod]

hi @brandonroberts ,
I can start with this.

[brandonroberts]

👍🏿

[itayod]

@brandonroberts
by "use a different set of files" you mean just the template ?

[timdeschryver]

I'm not Brandon, but yes these will be different templates.

[brandonroberts]

Different set of files. I have a WIP branch here for action creators https://github.com/ngrx/platform/compare/schematics-action-creators?expand=1

[itayod]

Thanks @brandonroberts and @timdeschryver
I actually done about the same thing in my wip branch :)

but I think this solution might be an overkill for the effect case.
since most of the content in the effect file is not the method of creating effect, most of the template will be similar.

anyway, so I if you'r ok with the solution I will write the UT for it and upload the PR 😄

[brandonroberts]

I agree in the effects case that its reasonable to keep it in the same template