Add TextureOptions::wrap_mode (#3954)

Exposes support in both glow and wgpu for texture wrap modes

This would be breaking for manual creations of TextureOptions but would
work with the current TextureOptions::NEAREST and LINEAR without change,
keeping those clamp to edge

I wasn't sure how best to expose the options to the user and added
consts for LINEAR_REPEAT LINEAR_MIRRORED_REPEAT NEAREST_REPEAT
NEAREST_MIRRORED_REPEAT

This does not include wrap mode clamp to border as it worked fine with
glow but with wgpu it panics due to Features
Features(ADDRESS_MODE_CLAMP_TO_BORDER) are required but not enabled on
the device, and I thought it was probably best not to try to enable that
feature, but happy to include that functionality also if that is okay to
be toggled


![image](https://github.com/emilk/egui/assets/5075747/bba71f61-a105-4e5b-b8ce-1083621eb3de)

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

crates/egui/src/lib.rs

@@ -395,7 +395,7 @@ pub use emath::{
 pub use epaint::{
     mutex,
     text::{FontData, FontDefinitions, FontFamily, FontId, FontTweak},
-    textures::{TextureFilter, TextureOptions, TexturesDelta},
+    textures::{TextureFilter, TextureOptions, TextureWrapMode, TexturesDelta},
     ClippedPrimitive, ColorImage, FontImage, ImageData, Mesh, PaintCallback, PaintCallbackInfo,
     Rounding, Shape, Stroke, TextureHandle, TextureId,
 };