feat: residential backyard chunks

[LilShiningMan]

Purpose of change

Add residential backyard chunks to add dynamic lawn features to domestic backyards

Describe the solution

Added Nest Container for residential backyards, which is what should be called by each individual house spawn. In the future additional chunk variants can be added to this nest container easily, which should be reflected in each house that calls this nested chunk without having to update each house individually.

Describe alternatives you've considered

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Testing

linted and spawned each chunk variant in game.

Additional context

There are only 2 variants at the moment, more to be added later.

NOTE: my previous PR for adding front lawn chunks has already been merged, but that isn't reflected in this PR as it has not been published in a public build as of yet. That's why it looks like the residential lawn chunks file has both the front lawn and the backyard chunks. Hopefully that doesn't create any confusion.

Checklist

[chaosvolt]

my previous PR for adding front lawn chunks has already been merged

Uh, no!? You closed and deleted #4281 before it was merged.

EDIT: And now we got it, easy fix just gave me a scare, hecc

[chaosvolt]

Okay, and I think that resolves the merge conflict, will approve and merge after tests are done this time :>

[LilShiningMan]

perfect, thanks!