feat: add Foundry Anvil image impl

[suchapalaver]

Community Testcontainers Implementation for Foundry Anvil

This is a community implementation of the Testcontainers interface for Foundry Anvil.

It is not officially supported by Foundry, but it is a community effort to provide a more user-friendly interface for running Anvil inside a Docker container.

The endpoint of the container is intended to be injected into your provider configuration, so that you can easily run tests against a local Anvil instance. See the test_anvil_node_container test in src/anvil/mod.rs to run this example:

let node = testcontainers_modules::anvil::AnvilNode::default().start().await.unwrap();
let port = node.get_host_port_ipv4(PORT).await.unwrap();

let provider: RootProvider<Http<_>, AnyNetwork> =
    RootProvider::new_http(format!("http://localhost:{port}").parse().unwrap());

let block_number = provider.get_block_number().await.unwrap();

assert_eq!(block_number, 0);

[suchapalaver]

The CI failures do not appear to be caused by the changes in this PR, unless I'm mistaken @DDtKey?

[DDtKey]

@suchapalaver Yes, gitea and oracle tests have became flaky in CI, not related to this PR.

[DDtKey]

Thank you for the contribution!

Just one comment and LGTM!

[suchapalaver]

@DDtKey thanks for your help on this one!