feat: add git_stash picker (#800)

lua/telescope/actions/init.lua

@@ -340,6 +340,23 @@ actions.git_create_branch = function(prompt_bufnr)
   end
 end
 
+--- Applies an existing git stash
+---@param prompt_bufnr number: The prompt bufnr
+actions.git_apply_stash = function(prompt_bufnr)
+  local selection = action_state.get_selected_entry()
+  actions.close(prompt_bufnr)
+  local _, ret, stderr = utils.get_os_command_output({ 'git', 'stash', 'apply', '--index', selection.value })
+  if ret == 0 then
+    print("applied: " .. selection.value)
+  else
+    print(string.format(
+      'Error when applying: %s. Git returned: "%s"',
+      selection.value,
+      table.concat(stderr, '  ')
+    ))
+  end
+end
+
 --- Checkout an existing git branch
 ---@param prompt_bufnr number: The prompt bufnr
 actions.git_checkout = function(prompt_bufnr)