feat: create and manage the .wws.toml file and its metadata

[Angelmmiguel]

The .wws.toml file includes information about the required runtimes for a specific project. It will allow other developers to quickly install these dependencies when pulling a new wws project.

In this PR, I moved the existing Config struct that referenced to workers configuration into the workers module. Then, I created a new Config fiel to refer to the .wws.toml file. The struct implements some of the methods thart will be required to interact with this file like:

• load
• save
• save_runtime
• remove_runtime

Example

let mut config = config::Config::load(&args.path).unwrap();
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();

config.remove_runtime("wlr", runtime);
config.save(&args.path).unwrap();

It closes #67

[Angelmmiguel]

This API is not exposed yet to devs, so I'm gonna merge these changes to continue with #63. Feel free to add any comment to this PR and I will apply them in a new one 😄