feat(hooks): add on_question_asked user hook

Introduce a new `on_question_asked` hook in the config, allowing users
to execute custom logic when a question is asked. Updated types and
renderer to support this hook, passing the session and question request
to the user-defined function.

Author: jugarpeupv

lua/opencode/config.lua

@@ -266,6 +266,7 @@ M.defaults = {
     on_session_loaded = nil,
     on_done_thinking = nil,
     on_permission_requested = nil,
+    on_question_asked = nil,
   },
   quick_chat = {
     default_model = nil,

lua/opencode/types.lua

@@ -213,6 +213,7 @@
 ---@field on_session_loaded? fun(session: Session): nil
 ---@field on_done_thinking? fun(session: Session): nil
 ---@field on_permission_requested? fun(session: Session): nil
+---@field on_question_asked? fun(session: Session, question_request: OpencodeQuestionRequest): nil
 
 ---@class OpencodeProviders
 ---@field [string] string[]

lua/opencode/ui/renderer.lua

@@ -1021,6 +1021,11 @@ function M.on_question_asked(properties)
     return
   end
 
+  if config.hooks and config.hooks.on_question_asked then
+    local session = state.active_session or {}
+    pcall(config.hooks.on_question_asked, session, properties)
+  end
+
   local question_window = require('opencode.ui.question_window')
   question_window.show_question(properties)
 end