fix(@schematics/angular): add "type" option in enum schematic

[mephistorine]

closes: #20667

[alan-agius4]

Thanks for this.

Couple of things

• Can you please drop the first commit?
• Kindly use @schematics/angular as commit message scope.
• Add closes: #20667 as commit message footer.

[mephistorine]

@alan-agius4 thanks, ok.

[alan-agius4]

LGTM, thanks for your contribution.

Can you kindly squash the commits? Thanks.

[mephistorine]

@alan-agius4 yes, give a second. :)

[alan-agius4]

LGTM, thanks

[mephistorine]

@alan-agius4 Thanks a lot 😃

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