refactor: cleanup gravity constant handling (#35866)

* refactor: move lateral methods from init to lateral.py (#2594)

* Extracting lateral methods to lateral.py

* cleaning

* more cleaning

* more cleaning

* Making sure it remains where it should

* Leave rate_limit where it belongs

* Moving things to `car/controls/`

* Moving rate limit to get a taste of the changes

* clean

* copy verbatim

* clean up

* more

* now we can format

---------

Co-authored-by: Shane Smiskol <shane@smiskol.com>

* No need to change order of import

* refactor: consolidate ACCELERATION_DUE_TO_GRAVITY import path

* bump opendbc

* update refs

* don't import from opendbc

---------

Co-authored-by: Shane Smiskol <shane@smiskol.com>
Co-authored-by: Adeeb Shihadeh <adeebshihadeh@gmail.com>

selfdrive/ui/onroad/hud_renderer.py

@@ -1,6 +1,6 @@
 import pyray as rl
 from dataclasses import dataclass
-from openpilot.common.conversions import Conversions as CV
+from openpilot.common.constants import CV
 from openpilot.selfdrive.ui.onroad.exp_button import ExpButton
 from openpilot.selfdrive.ui.ui_state import ui_state, UIStatus
 from openpilot.system.ui.lib.application import gui_app, FontWeight