feat: Warn on unknown language. #1066

Job	Run time
generate-job-matrix	1m 36s
check-needs-run	4s
Bindings - Synchronise	26s
Check - Bencher(windows-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	33m 12s
Check - Test(windows-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	33m 12s
Check - Check(windows-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	28m 58s
Check - Check(macos-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	11m 34s
Check - Build(ubuntu-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	24m 46s
Check - Build(ubuntu-latest) - all features	27m 17s
Check - Bencher(macos-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	33m 29s
Check - Build(ubuntu-latest) - -core_functions,mlua_async,mlua_macros,mlua_serialize,profile_with_tracy,rhai,unsafe_lua_modules	26m 58s
Check - Test(macos-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	24m 26s
Check - Test(ubuntu-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	31m 26s
Check - Check(ubuntu-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	13m 39s
Check - Build(ubuntu-latest) - -core_functions,mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	23m 55s
Check - Docs(ubuntu-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	29m 2s
Check - Bencher(ubuntu-latest) - mlua_async,mlua_macros,mlua_serialize,rhai,unsafe_lua_modules	33m 13s
	6h 17m 13s

Provide feedback