zgx-mlua 0.12.2

mlua 0.12.2 with zgx's table walk and userdata fixes (see ZGX_PATCH.md). High level bindings to Lua 5.5/5.4/5.3/5.2/5.1 (including LuaJIT) and Luau with async/await features and support of writing native Lua modules in Rust.

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# zgx: upstream's code as it is (a path dependency, `cargo fmt --all` reaches it).
disable_all_formatting = true