Use objc2-metal with metal naming scheme

To keep the diff smaller and easier to review, this uses a temporary
fork of `objc2-metal` and `objc2-quartz-core` whose methods use the
naming scheme of the `metal` crate.

One particular difficult part with this is that the `metal` crate has
several methods where the order of the arguments are swapped relative
to the corresponding Objective-C methods.

This includes most perilously (since these have both an offset and an
index argument, both of which are integers):
- `set_bytes`
- `set_vertex_bytes`
- `set_fragment_bytes`
- `set_buffer`
- `set_vertex_buffer`
- `set_fragment_buffer`
- `set_threadgroup_memory_length`

But also:
- `set_vertex_texture`
- `set_fragment_texture`
- `set_sampler_state`
- `set_vertex_sampler_state`
- `set_fragment_sampler_state`

Another noteworthy thing to mention is that `objc2-metal` does not (yet)
provide a fallback for MTLCopyAllDevices, so we have to do that
ourselves:
madsmtm/objc2@3543940

Author: madsmtm

CHANGELOG.md

@@ -558,6 +558,9 @@ By @cwfitzgerald in [#6811](https://github.com/gfx-rs/wgpu/pull/6811), [#6815](h
 - Move incrementation of `Device::last_acceleration_structure_build_command_index` into queue submit. By @Vecvec in [#7462](https://github.com/gfx-rs/wgpu/pull/7462).
 - Implement indirect draw validation. By @teoxoy in [#7140](https://github.com/gfx-rs/wgpu/pull/7140)
 
+#### Metal
+- Use autogenerated `objc2` bindings internally, which should resolve a lot of leaks and unsoundness. By @madsmtm in [#5641](https://github.com/gfx-rs/wgpu/pull/5641).
+
 #### Vulkan
 
 - Stop naga causing undefined behavior when a ray query misses. By @Vecvec in [#6752](https://github.com/gfx-rs/wgpu/pull/6752).

Cargo.lock

@@ -194,10 +194,59 @@ which = "8"
 xshell = "0.2.2"
 
 # Metal dependencies
-metal = "0.32"
-block = "0.1.6"
-core-graphics-types = "0.2"
-objc = "0.2.5"
+block2 = { version = "0.6", git = "https://github.com/madsmtm/objc2", branch = "metal-wgpu" }
+objc2 = { version = "0.6", git = "https://github.com/madsmtm/objc2", branch = "metal-wgpu" }
+objc2-core-foundation = { version = "0.3", default-features = false, features = [
+    "std",
+    "CFCGTypes",
+], git = "https://github.com/madsmtm/objc2", branch = "metal-wgpu" }
+objc2-foundation = { version = "0.3", default-features = false, features = [
+    "std",
+    "NSError",
+    "NSProcessInfo",
+    "NSRange",
+    "NSString",
+], git = "https://github.com/madsmtm/objc2", branch = "metal-wgpu" }
+objc2-metal = { version = "0.3", default-features = false, features = [
+    "std",
+    "block2",
+    "MTLAllocation",
+    "MTLBlitCommandEncoder",
+    "MTLBlitPass",
+    "MTLBuffer",
+    "MTLCaptureManager",
+    "MTLCaptureScope",
+    "MTLCommandBuffer",
+    "MTLCommandEncoder",
+    "MTLCommandQueue",
+    "MTLComputeCommandEncoder",
+    "MTLComputePass",
+    "MTLComputePipeline",
+    "MTLCounters",
+    "MTLDepthStencil",
+    "MTLDevice",
+    "MTLDrawable",
+    "MTLEvent",
+    "MTLLibrary",
+    "MTLPipeline",
+    "MTLPixelFormat",
+    "MTLRenderCommandEncoder",
+    "MTLRenderPass",
+    "MTLRenderPipeline",
+    "MTLResource",
+    "MTLSampler",
+    "MTLStageInputOutputDescriptor",
+    "MTLTexture",
+    "MTLTypes",
+    "MTLVertexDescriptor",
+], git = "https://github.com/madsmtm/objc2", branch = "metal-wgpu" }
+objc2-quartz-core = { version = "0.3", default-features = false, features = [
+    "std",
+    "objc2-core-foundation",
+    "CALayer",
+    "CAMetalLayer",
+    "objc2-metal",
+], git = "https://github.com/madsmtm/objc2", branch = "metal-wgpu" }
 raw-window-metal = "1.0"
 
 # Vulkan dependencies