Dialog injection tokens

[salarenko]

Is this a bug, enhancement, or feature request?

enhancement

Briefly describe your proposal.

Currently Dialog is using DIALOG_CONFIG and DIALOG_REF injections token for providing config and ref dependencies. Having additional tokens makes it harder for the user to implement the Dialog (user needs to know and remember about the tokens).
The proposition is to remove DIALOG_CONFIG and DIALOG_REF and make DialogConfig and DialogRef injectable. This will result in user having to write this:

constructor(
    public dialogConfig: DialogConfig,
    public dialogRef: DialogRef
) { }

instead of:

constructor(
    @Inject(DIALOG_CONFIG) public dialogConfig: DialogConfig,
    @Inject(DIALOG_REF) public dialogRef: DialogRef
) { }

2h - document; keep both approaches for now and deprecate the current