Add the ability to specify source priority manually

lua/cmp/menu.lua

@@ -89,7 +89,7 @@ menu.update = function(self, ctx, sources)
     if s.offset <= offset then
       if not has_triggered_by_symbol_source or s.is_triggered_by_symbol then
         -- source order priority bonus.
-        local priority = (#sources - (i - 1)) * config.get().sorting.priority_weight
+        local priority = s:get_config().priority or ((#sources - (i - 1)) * config.get().sorting.priority_weight)
 
         for _, e in ipairs(s:get_entries(ctx)) do
           e.score = e.score + priority

lua/cmp/types/cmp.lua

@@ -100,6 +100,7 @@ cmp.PreselectMode.None = 'none'
 ---@class cmp.SourceConfig
 ---@field public name string
 ---@field public opts table
+---@field public priority number|nil
 ---@field public keyword_pattern string
 ---@field public keyword_length number
 ---@field public max_item_count number