Expose command encoders (#3271)

# Objective
I'm exposing these command encoders so bevy user's can create their own command encoders. This is useful when you want to copy a texture to a texture or create a compute pass manually for example.

Note: I formatted this file which might of changed the order of some exports.

## Solution
Just re-export `CommandEncoder` and `CommandEncoderDescriptor`.

pipelined/bevy_render2/src/render_resource/mod.rs

@@ -25,13 +25,13 @@ pub use wgpu::{
     util::BufferInitDescriptor, AddressMode, BindGroupDescriptor, BindGroupEntry,
     BindGroupLayoutDescriptor, BindGroupLayoutEntry, BindingResource, BindingType, BlendComponent,
     BlendFactor, BlendOperation, BlendState, BufferAddress, BufferBindingType, BufferSize,
-    BufferUsages, ColorTargetState, ColorWrites, CompareFunction, ComputePassDescriptor,
-    ComputePipelineDescriptor, DepthBiasState, DepthStencilState, Extent3d, Face, FilterMode,
-    FragmentState as RawFragmentState, FrontFace, ImageCopyBuffer, ImageCopyBufferBase,
-    ImageCopyTexture, ImageCopyTextureBase, ImageDataLayout, ImageSubresourceRange, IndexFormat,
-    LoadOp, MultisampleState, Operations, Origin3d, PipelineLayout, PipelineLayoutDescriptor,
-    PolygonMode, PrimitiveState, PrimitiveTopology, RenderPassColorAttachment,
-    RenderPassDepthStencilAttachment, RenderPassDescriptor,
+    BufferUsages, ColorTargetState, ColorWrites, CommandEncoder, CommandEncoderDescriptor,
+    CompareFunction, ComputePassDescriptor, ComputePipelineDescriptor, DepthBiasState,
+    DepthStencilState, Extent3d, Face, FilterMode, FragmentState as RawFragmentState, FrontFace,
+    ImageCopyBuffer, ImageCopyBufferBase, ImageCopyTexture, ImageCopyTextureBase, ImageDataLayout,
+    ImageSubresourceRange, IndexFormat, LoadOp, MultisampleState, Operations, Origin3d,
+    PipelineLayout, PipelineLayoutDescriptor, PolygonMode, PrimitiveState, PrimitiveTopology,
+    RenderPassColorAttachment, RenderPassDepthStencilAttachment, RenderPassDescriptor,
     RenderPipelineDescriptor as RawRenderPipelineDescriptor, SamplerDescriptor, ShaderModule,
     ShaderModuleDescriptor, ShaderSource, ShaderStages, StencilFaceState, StencilOperation,
     StencilState, StorageTextureAccess, TextureAspect, TextureDescriptor, TextureDimension,