Array contents support

[hahn-kev]

Add support for auto complete in cases where using an array. A simple example is like these, more in unit tests

---@alias Option "AAA" | "BBB" | "CCC"

---@type Option[]
local l = {"<??>"}

---@class OptionObj
---@field a boolean
---@field b boolean

---@type OptionObj[]
local l = { {<??>} }

these 2 examples will autocomplete with either the expected enum for the first case, or the expected object fields in the second.

Also, I might have screwed up the merge for sub modules, but I think I did it right?

[sumneko]

Thanks for your work!
But please rebase your branch to avoid pushing changes of submodules.

[hahn-kev]

@sumneko submodules fixed.

[sumneko]

Thank you!