Request: Support `@field` in both enum and table definitions.

Request: Allow adding a field type to tables and enum definitions using the @field annotation.

This is useful for generating meta files from C code where there is no Lua table literal to copy.

See current behaviour below:

@class

✅ Using @field

---@class Foo
---@field myField 5
Foo = {}

✅ Using literal code

---@class Foo
Foo = {
  myField = 5,
}

✅ Using type annotation

---@class Foo
Foo = {
  ---@type 5
  myField = nil,
}

@enum

❌ Using field

---@enum Foo
---@field myField 5
Foo = {}

Error: The field must be defined after the class.Lua Diagnostics.(doc-field-no-class)

✅ Using literal code

---@enum Foo
Foo = {
  myField = 5,
}

✅ Using type annotation

---@enum Foo
Foo = {
  ---@type 5
  myField = nil,
}

Untyped table

❌ Using field

---@field myField 5
Foo = {}

Error: The field must be defined after the class.Lua Diagnostics.(doc-field-no-class)

✅ Using literal code

Foo = {
  myField = 5,
}

✅ Using type annotation

Foo = {
  ---@type 5
  myField = nil,
}

首先跟踪与 doc-field-no-class 诊断相关的 @field 处理；issue 提供了关于 @class、@enum 和无类型表的 Lua 示例。完成的标准是，像示例中那样，@field 定义能够用于 enum 和表定义且不会出现该诊断，同时现有的类行为仍受支持。