feat: Allow setting inlay name in Lua

[enzi221]

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Summary

Lua generateImage() can set the inlay's name.

Related Issues

None.

Changes

An alternative to #1644. Instead of changing the ID, this PR lets Lua set the inlay asset's name.

This brings no notable benefit on its own, but it opens the way to UX improvements such as searching images by name in the inlay asset explorer.

Script authors can also use it in place of #1259 if they choose to.

I hope either this or #1259 gets merged, or both.

Impact

None.