adds (space) lizard inhands and onheads (#76198)

## About The Pull Request
The axolotl sprites were based on the lizard sprites so now the axolotl
inhands and onheads will fuel the lizard equivalents to complete the
circle of life.

**Lizard inhands and onheads:**

![lizarbs](https://github.com/tgstation/tgstation/assets/94711066/523c2e1f-b0c8-41ac-9596-7d315381f743)
one of the sprites had a mistake and I didn't wanna redo the entire
picture so here's the updated sprite:

![lizarbfromback](https://github.com/tgstation/tgstation/assets/94711066/a978ea92-6205-42d5-9ed5-b8ae98375c9e)


**Space lizard inhands and onheads:**

![lizarbsfromspace](https://github.com/tgstation/tgstation/assets/94711066/6175a3a4-004f-4abe-b4f3-7f948cb0120f)


The held weight of lizards has been changed to tiny because they look
like they could fit into your pocket. This value wasn't specified before
and it seems to default to normal weight, which seems a bit much for a
creature that's about the same size as a mouse.
## Why It's Good For The Game
More cute little animals to hold on your hands. And they can fit into
your pockets now too!
## Changelog
🆑
image: added lizard inhand- and onhead sprites
image: added space lizard inhand- and onhead sprites
fix: changed held weight class of lizards from normal to tiny
/🆑

code/modules/mob/living/basic/vermin/lizard.dm

@@ -33,6 +33,11 @@
 	obj_damage = 0
 	environment_smash = ENVIRONMENT_SMASH_NONE
 	can_be_held = TRUE
+	held_w_class = WEIGHT_CLASS_TINY
+	held_lh = 'icons/mob/inhands/animal_item_lefthand.dmi'
+	held_rh = 'icons/mob/inhands/animal_item_righthand.dmi'
+	worn_slot_flags = ITEM_SLOT_HEAD
+	head_icon = 'icons/mob/clothing/head/pets_head.dmi'
 	ai_controller = /datum/ai_controller/basic_controller/lizard
 
 	/// Typecache of things that we seek out to eat. Yummy.