feat(stages): support `Reth` L1Client

[merklefruit]

In the L1 Executor stage, we should add support for the Reth execution client.

https://github.com/anton-rs/op-up/blob/b6d5ebb2bcfdd8743d2d687c5aa9711fc8d48494/crates/stages/src/stages/l1_exec.rs#L26-L29

This will require setting up the Dockerfile (and an entrypoint file if necessry) and checking that:

1. the image is built successfully
2. the container is created successfully
3. the container is started successfully
4. the ports are bound correctly, and the assigned RPC API port is responding