Add a prewater render stage for 3D lines and 3D primitives

[FileEX]

Summary

This PR adds a new prewater render stage to the 3D line and 3D primitive rendering functions, allowing them to be rendered underwater.

Motivation

Closes #4671

Test plan

addEventHandler("onClientPreRender", root, function()
	dxDrawLine3D(2604, -2698, -6, 2604, -2398, -6, 0xffffffff, 10, 'prewater')
end)
``