add optional includes to plugin options

[OlegLustenko]

Hi, I see your other plugin such as craco-esbuild

And craco-esbuild has 1 more settings such as optionalIncludes.
I've extended this plugin so it's also contains this property

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Latest commit: 9a943d2

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[pradel]

LGTM, thanks for the change!
Could you please update the documentation file similar to reflect the option?

[OlegLustenko]

@pradel, thanks for review and good point, updated!

[pradel]

@OlegLustenko could you just add a changeset to the pr? I will be able to release it directly that way