Generic class field

[Vurv78]

Describe the bug
Generics do not work when declaring classes,
I get Undefined type or alias T, and the field data does not autocomplete.

I am not sure if this is intentional or not because the <T> does highlight in the ---@class properly. I didn't see anyone using generic class fields though although I thought that'd be a very common usecase.

To Reproduce

---@class Test<T>
---@field data T

---@return Test<number>
function Test.new()
	return {}
end

local x = Test.new()

Expected behavior
I expected the field data to be defined as a number

Screenshots

Environment (please complete the following information):

• OS: Windows
• Is WSL remote? No
• Client: VSCode

[sumneko]

see #734