Usage related changes

• Close Enable general JSON-RPC support via websockets #829
  • Includes support for starknet_ and devnet_ JSON-RPC methods.
• Restarting or loading Devnet no longer leads to killing of websocket connections; merely the subscriptions are forgotten.

Development related changes

• Reorganize RPC request enums.
• Remove lazy_static from starknet-devnet-server by simplifying the implementation of the list of default restricted RPC methods
• Remove unused deploy_account_str util fn
• Modify crates/starknet-devnet-server/src/test_utils::assert_contains to return unwrappable Result instead of panicking
  • This improves stack trace in failed tests
  • There is another function of the same name: tests/integration/common/utils::assert_contains. It is left untouched and delegated to the newly created Custom assertion methods could benefit from returning Result #845.
• Un-ignore the existing general RPC support tests
  • They were added back when ws support was originally introduced, when we thought we would have general RPC support
• I couldn't think of anything better, so I left a reminder with If adding a new variant to the JsonRpcRequest enum.

Checklist:

• Checked out the contribution guidelines
• Applied formatting - ./scripts/format.sh
• No linter errors - ./scripts/clippy_check.sh
• No unused dependencies - ./scripts/check_unused_deps.sh
• No spelling errors - ./scripts/check_spelling.sh
• Performed code self-review
• Rebased to the latest commit of the target branch (or merged it into my branch)
  • Once you make the PR reviewable, please avoid force-pushing
• Updated the docs if needed - ./website/README.md
• Linked the issues resolvable by this PR - linking info
• Updated the tests if needed; all passing - execution info