[Task] Refactor `IotaIdentityClient` interface

[PhilippGackstatter]

Description

Refactor the IotaIdentityClient trait/interface to:

pub trait IotaIdentityClient {
  /// Returns the NetworkInfo of the connected IOTA node.
  async fn get_network_info(&self) -> Result<NetworkInfo>;

  /// Resolve an Alias identifier, returning its latest [`OutputId`] and [`AliasOutput`].
  async fn get_alias_output(&self, alias_id: AliasId) -> Result<(OutputId, AliasOutput)>;
}

Motivation

The interface currently has three specialized methods for individual parts of the larger network info object. We can simplify this for implementations of the interface.

Resources

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To-do list

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• [ ] Refactor the Rust trait
• [ ] Refactor the TS interface

Change checklist

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• [ ] The feature or fix is implemented in Rust and across all bindings whereas possible.
• [ ] The feature or fix has sufficient testing coverage
• [ ] All tests and examples build and run locally as expected
• [ ] Every piece of code has been document according to the documentation guidelines.
• [ ] If conceptual documentation (mdbook) and examples highlighting the feature exist, they are properly updated.
• [ ] If the feature is not currently documented, a documentation task Issue has been opened to address this.