feat: create methods to manage runtimes

[Angelmmiguel]

This PR includes several refactors and new features to manage language runtimes. In general, this PR prepares the code for the complete feature. The main changes applied to this PR are:

• Create a new set of utilities for fetching data. It uses reqwest in async mode. For the validation side, it receives a Checksum instance to validate against the content.
• Refactor the Data struct that was used for language runtimes to install transient files in a .wws directory. Now, we also need to download and store runtime files such as wasm modules, polyfills and templates. For this reason, I moved the .wws folder management into a global Store struct. I also fixed the routes to work on Windows too.
• Create a "manager" set of utilities to initialize runtimes, install and download associated files. It uses the aforementioned Store struct to create the files in the correct location.
• Merge all repository / runtime metadata structs into a common runtimes/metadata.rs file. This way is less confusing to understand the scope of those structs.
• Unfortunately, I run into lifetimes issues with Serde and the Repository -> Runtime -> RemoteFile struct. In the end, I opted for making all owned types and revisit it in the future 😞
• Add a filename field to the RemoteFile struct.

Usage experience

println!("🗺  Fetching index!");
let repo = Repository::from_remote_file(
    "https://raw.githubusercontent.com/Angelmmiguel/wws-index-test/main/index.toml",
).await.unwrap();

let runtime = repo.runtimes.first().unwrap()

println!("🗺  Installing  runtime...");
println!("{}", runtime);
install_runtime("wlr", runtime).await.unwrap();

And then, you can inspect the .wws folder:

~/W/o/wws ❯❯❯ tree .wws
.wws
├── runtimes
│   ├── rust
│   └── wlr
│       └── ruby
│           └── 3.2.0+20230118-8aec06d
│               ├── poly.rb
│               ├── ruby.wasm
│               └── template.txt
└── workers
    └── js
        └── 961b7b706f36e745dc7c3306a2a41214ddac3ad41a38fa8da6a2460058235420
            └── index.js

It closes #66

[Angelmmiguel]

Added a new commit to prepare the metadata to be serialized. This required to update TOML to v0.6.0 to avoid an issue regarding serialization of values and tables (see toml-rs/toml-rs#142).

On this version, toml removed the support for from_slice, so I had to use the from_str method instead (see v0.6.0 changelog).

The reason why I'm adding it here is to prepare the metadata to be serialized on #67

[Angelmmiguel]

Added a new commit to fix the location of the .wws folder. It was using the current path instead of the project path. For example, if we run the following command:

wws ./examples/js-basic

Before this commit, the .wws would be located in ./.wws. However, the correct path for this folder is the project one: ./examples/js-basic/.wws. The last commit fixes that behavior.

[ereslibre]

LGTM, minor comments