feat: ask selected code block (#39)

lua/avante/range.lua

@@ -0,0 +1,24 @@
+--@class avante.Range
+--@field start table Selection start point
+--@field start.line number Line number of the selection start
+--@field start.col number Column number of the selection start
+--@field finish table Selection end point
+--@field finish.line number Line number of the selection end
+--@field finish.col number Column number of the selection end
+local Range = {}
+Range.__index = Range
+-- Create a selection range
+-- @param start table Selection start point
+-- @param start.line number Line number of the selection start
+-- @param start.col number Column number of the selection start
+-- @param finish table Selection end point
+-- @param finish.line number Line number of the selection end
+-- @param finish.col number Column number of the selection end
+function Range.new(start, finish)
+  local self = setmetatable({}, Range)
+  self.start = start
+  self.finish = finish
+  return self
+end
+
+return Range