feat: support identifier enum variant

[numToStr]

This PR adds support for enum variant which includes identifier as its member.

• Literal variant

Member will always be treated as string value. This matches the LLS behavior.

---| '<literal>' [# description]

• Identifier variant

---| `<identifier>` [# description]

Emmylua

---Vim operator-mode motions.
---
---Read `:h map-operator`
---@alias VMode
---| '"line"' # Vertical motion
---| '"char"' # Horizontal motion
---| 'v'
---| `some.ident` # Some identifier

Help

VMode                                                                    *VMode*
    Vim operator-mode motions.

    Read `:h map-operator`

    Variants: ~
        ("line")      Vertical motion
        ("char")      Horizontal motion
        ("v")
        (some.ident)  Some identifier

Screenshot

• Inline enum

• ---@alias enum