refactor: Improve DevX

[Karrq]

The aim of this PR is to improve the DevX by providing a more streamlined set of scripts to setup and start testing the environment locally, but also aid during first checkout, by fetching all required external dependencies, not otherwise present in the repo.

NOTE: Originally the PR moved rabby from the root to deps/rabby for consistency, but that exploded the number of changed files. So this PR still has the assumption that rabby lives in deps/rabby, but the rabby fork will be moved in a separate PR.

TODO:

• External dependency management
• Migrate gateway config and start
• Migrate main node config and start (with existing chain)
• Migrate L2 chain deployment
• Migrate common operations (start/stop, logs, ...)
• Migrate testing recipes
• Update README

[pamungkaski]

@claude plz review

[Karrq]

There are some things I'd like to clarify to improve this further:

1. BOP_EL_PORT, OP_EL_PORT, BOP_NODE_PORT and SEQ seem to be used but I'm unable to determine what their values should be
2. fix-compose recipe is used but I can't find its definition
3. spamoor-daemon folder is used but can't find it in the repo
4. how are gateway-spam and gateway-bench supposed to be used?

[BrycePy]

Commit dcf5bb2 seems to break the just reset-and-start-full-stack-local command. I'm getting the following errors:

Resetting configuration and deploying new L2 from scratch
just -f /home/su/based-op/Justfile main-node reset
just -f based/main-node.just reset
cat: /home/su/based-op/.local/.wallet/batcher/key: No such file or directory
error: Recipe `key` failed on line 68 with exit code 1
error: Call to function `shell` failed: Process exited with status code 1
  ——▶ main-node.just:20:48
   │
20 │ export OP_BATCHER_KEY := env("OP_BATCHER_KEY", shell(wallet + " key batcher"))
   │                                                ^^^^^
error: Recipe `main-node` failed on line 66 with exit code 1
error: Recipe `reset` failed on line 96 with exit code 1
just -f based/main-node.just config-with-deploy
cat: /home/su/based-op/.local/.wallet/batcher/key: No such file or directory
error: Recipe `key` failed on line 68 with exit code 1
error: Call to function `shell` failed: Process exited with status code 1
  ——▶ main-node.just:20:48
   │
20 │ export OP_BATCHER_KEY := env("OP_BATCHER_KEY", shell(wallet + " key batcher"))
   │                                                ^^^^^
error: Recipe `main-node` failed on line 66 with exit code 1
error: Recipe `reset-and-start-full-stack-local` failed with exit code 1