feat: cmp async (#1583)

lua/cmp/context.lua

@@ -16,6 +16,7 @@ local api = require('cmp.utils.api')
 ---@field public cursor_line string
 ---@field public cursor_after_line string
 ---@field public cursor_before_line string
+---@field public aborted boolean
 local context = {}
 
 ---Create new empty context
@@ -55,9 +56,14 @@ context.new = function(prev_context, option)
   self.cursor.character = misc.to_utfindex(self.cursor_line, self.cursor.col)
   self.cursor_before_line = string.sub(self.cursor_line, 1, self.cursor.col - 1)
   self.cursor_after_line = string.sub(self.cursor_line, self.cursor.col)
+  self.aborted = false
   return self
 end
 
+context.abort = function(self)
+  self.aborted = true
+end
+
 ---Return context creation reason.
 ---@return cmp.ContextReason
 context.get_reason = function(self)