Publish luau and selene definition files

[WolfGangS]

I think it would be helpful to people not using vscode to have the definition files published along side the extension on release.

Making it part of the github actions release process shouldn't be too hard

[Rider-Linden]

Those files are actually only used if the plugin hasn't (or can't) pull a fresh definition file from the viewer. The viewer's version is canonical.

[WolfGangS]

I think there should be an official source for them without having to install the extension.

Once something like slua-definitions.yml is added to https://github.com/secondlife/lsl-definitions/ there could in theory be a generate release version of the files.

Though breaking the core part of the extension out to make it runnable on its own does mitigate the need somewhat