Restore manganis optimizations (#3195)

* Create a crate for constant serialization of config structs for manganis
* use SerializeConst for the image asset builder
* switch to a declarative macro for assets
* add serializable options for each asset type
* implement the new manganis macro
* optimize assets in the CLI
* Fix assets with dioxus formattable
* reduce fuzzing test limits
* use the new syntax in examples
* fix avif support
* Fix manganis doc tests
* cache asset optimization
* Split out asset and bundled asset
* make hash pointer width independent
* Fix manganis macro docs
* add constvec::is_empty method to fix clippy lint
* remove nasm feature
* simplify test_rsplit_once test so typos passes
* revert example change from clippy fix
* always accept unix paths
* fix windows path seperator
* fix folder asset hash
* Optimize assets in a blocking task
* Fix asset options docs
* Document Asset and BundledAsset
* simplify the linker macro a bit
* add more docs to AssetParser expansion
* add image format helpers
* Split by  both unix and windows path separators and take the smallest one

packages/manganis/manganis/README.md

@@ -0,0 +1,31 @@
+# Manganis
+
+The Manganis allows you to submit assets to any build tool that supports collecting assets. It makes it easy to self-host assets that are distributed throughout your libraries. Manganis also handles optimizing, converting, and fetching assets.
+
+If you defined this in a component library:
+
+```rust
+use manganis::{Asset, asset};
+const AVIF_ASSET: Asset = manganis::asset!("/assets/image.png");
+```
+
+AVIF_ASSET will be set to a new file name that will be served by some CLI. That file can be collected by any package that depends on the component library.
+
+```rust
+use manganis::{ImageFormat, ImageAssetOptions, Asset, asset, ImageSize};
+// You can collect arbitrary files. Absolute paths are resolved relative to the package root
+const _: Asset = asset!("/assets/script.js");
+
+// You can collect images which will be automatically optimized
+pub const PNG_ASSET: Asset =
+    asset!("/assets/image.png");
+// Resize the image at compile time to make the assets smaller
+pub const RESIZED_PNG_ASSET: Asset =
+    asset!("/assets/image.png", ImageAssetOptions::new().with_size(ImageSize::Manual { width: 52, height: 52 }));
+// Or convert the image at compile time to a web friendly format
+pub const AVIF_ASSET: Asset = asset!("/assets/image.png", ImageAssetOptions::new().with_format(ImageFormat::Avif));
+```
+
+## Adding Support to Your CLI
+
+To add support for your CLI, you need to integrate with the [manganis_cli_support](https://github.com/DioxusLabs/manganis/tree/main/cli-support) crate. This crate provides utilities to collect assets that integrate with the Manganis macro. It makes it easy to integrate an asset collection and optimization system into a build tool.