fix: incorrect infer of function array annotation on tables

[tomlau10]

fix #2367

bugfix explanation:

• { function() end } is parsed as tableexp
  but it is not considered as assign type
  => so it is not receiving type infer from ---@type {[integer]: fun()} annotation
  Way to @type annotate array of functions without { [integer]: fun() } #2367 (comment)
• the ---@type fun()[] annotation is giving out doc.type.function when inferring tableindex operation
  but is ignored by the current logic
  => so { [1] = function () end } cannot receive type infer
  Way to @type annotate array of functions without { [integer]: fun() } #2367 (comment)