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_glow/src/painter.rs

@@ -34,6 +34,20 @@ impl TextureFilterExt for egui::TextureFilter {
     }
 }
 
+trait TextureWrapModeExt {
+    fn glow_code(&self) -> u32;
+}
+
+impl TextureWrapModeExt for egui::TextureWrapMode {
+    fn glow_code(&self) -> u32 {
+        match self {
+            Self::ClampToEdge => glow::CLAMP_TO_EDGE,
+            Self::Repeat => glow::REPEAT,
+            Self::MirroredRepeat => glow::MIRRORED_REPEAT,
+        }
+    }
+}
+
 #[derive(Debug)]
 pub struct PainterError(String);
 
@@ -555,12 +569,12 @@ impl Painter {
             self.gl.tex_parameter_i32(
                 glow::TEXTURE_2D,
                 glow::TEXTURE_WRAP_S,
-                glow::CLAMP_TO_EDGE as i32,
+                options.wrap_mode.glow_code() as i32,
             );
             self.gl.tex_parameter_i32(
                 glow::TEXTURE_2D,
                 glow::TEXTURE_WRAP_T,
-                glow::CLAMP_TO_EDGE as i32,
+                options.wrap_mode.glow_code() as i32,
             );
             check_for_gl_error!(&self.gl, "tex_parameter");