implement table type access modifiers

[jackdotink]

Implements table type access modifiers:

type foo = {
    read bar: number
    write baz: string,
}

[Kampfkarren]

Need tests for this as well

[jackdotink]

@DataM0del try again because it works for me

[DataM0del]

@DataM0del try again because it works for me

I'll update my Luau version. I wish though that Luau would have a --version command but the PR for that isn't moving because of complaints about how you have to change the version macro value to the current version or etc.

[DataM0del]

I updated. It works now.

[DataM0del]

@DataM0del try again because it works for me

Actually, it doesn't work because of the trailing comma.