feat: allow configuring the http_requests via TOML

[Angelmmiguel]

In Wasm Workers Server, we want to follow the capability-based model that Wasm and WASI are enforcing. By default, workers cannot make HTTP requests. To enable it, you need to add a related configuration for the worker and enable only the specific requests you want.

For example:

name = "js-fetch"
version = "1"

[features]
[features.http_requests]
allowed_methods = ["GET"]
allowed_hosts = ["jsonplaceholder.typicode.com"]
allow_http = false

The default values for these config params are:

Param	Default value
allowed_methods	["GET", "POST", "PUT", "PATCH", "DELETE"]
allowed_hosts	[]
allow_http	false

It refs #165

[ereslibre]

This is great! Some comments to have more idiomatic code :)

[ereslibre]

Great! LGTM 👏