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-wgpu/src/renderer.rs

@@ -923,12 +923,19 @@ fn create_sampler(
         epaint::textures::TextureFilter::Nearest => wgpu::FilterMode::Nearest,
         epaint::textures::TextureFilter::Linear => wgpu::FilterMode::Linear,
     };
+    let address_mode = match options.wrap_mode {
+        epaint::textures::TextureWrapMode::ClampToEdge => wgpu::AddressMode::ClampToEdge,
+        epaint::textures::TextureWrapMode::Repeat => wgpu::AddressMode::Repeat,
+        epaint::textures::TextureWrapMode::MirroredRepeat => wgpu::AddressMode::MirrorRepeat,
+    };
     device.create_sampler(&wgpu::SamplerDescriptor {
         label: Some(&format!(
             "egui sampler (mag: {mag_filter:?}, min {min_filter:?})"
         )),
         mag_filter,
         min_filter,
+        address_mode_u: address_mode,
+        address_mode_v: address_mode,
         ..Default::default()
     })
 }