Add filtering options for texture sets

[moonyuet]

Changelog Description

This PR is to add support for filtering texture sets for texture instances. Users can choose which texture set(s) with Export Texture Set(s) they want to export in Ayon. If they leave the options empty, the system will export all texture sets as default.
Resolve #21, #18

Additional review information

N/A

Testing notes:

1. Launch Substance Painter
2. Create Texture Instance with/without Export Texture Set(s)
3. Publish

[BigRoy]

Didn't test - but code looks good to me. Just the one remainder attribute def tooltip comment.

[LiborBatek]

It does work when only selected texture set been chosen

but it does not work when no texture_set been selected and kept empty (aka no texture set).

Then instead of producing all the present texture_sets images produce nothing...

[BigRoy]

Didn't test but code looks fine to me.

[LiborBatek]

Works like charm now!

I have done multiple tests and combos to publish just selected texture_set with diff channels selected etc.

All working nicely!