Improvements to AccountComponentMetadata

[igamigo]

Currently, the AccountComponentMetadata contains the following fields:

pub struct AccountComponentMetadata {
    /// The human-readable name of the component.
    name: String,
    /// A brief description of what this component is and how it works.
    description: String,
    /// The semantic version of the component.
    /// This can be used to track and manage component upgrades.
    version: Version,
    /// A set of supported target account types for this component.
    targets: BTreeSet<AccountType>,
    /// A list of storage entries defining the component's storage layout and initialization
    /// values.
    storage: Vec<StorageEntry>,
}

This struct can be serialized to and deserialized from TOML files.

There are some things that we could add to make this more useful, specially in the context of other systems "outside" of the protocol itself, like component registries.

As suggested during the PR review, some of these could build toward something like what the Rust ecosystem does (one can think of links to documentation, authors, categories, etc.)