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: 9a943d2b3da7bbcfe7cad2bb1910ca154c93ce00

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[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