key map value of enum

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### Issue Description

I want to try creating an Event enum to use for the registering Event method, but enum doesn't seem to support key table values
If it can be completed normally like this
but
If you define a variable or parameter as an enumeration, lls will not know what value it has
What I want is to use extend like class, like --- @ class Event: {functionName: string,...}
but enum does not seem to support extend

### Additional Notes

_No response_

No source files or tests are named. Start by reproducing the Event enum, registering Event method, and enum-typed variable or parameter examples in LuaLS, then inspect the enum type-handling entry points. Done should be defined as a documented behavior for exposing key-table values and supporting the requested Event shape, with tests covering the examples.

Written by the indexing model from the issue text.