feat: Categories retrieve + list API

[olivermrbl]

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[olivermrbl]

These are temporary until we figure out what we want to do with the ProductCategoryService. Right now, it is a custom service not using the abstract service factory, so the free text search is not supported out of the box.

cc @adrien2p

[sradevski]

Nice 👍

I haven't put much focus on categories as I believe might need some thinking through, but this is nice that we get at least the basic things working