Rm redundant error codes

[emhane]

Remove redundant supervisor RPC error codes. Instead the error code section should mention that supervisor impls should refer to https://ethereum-json-rpc.com/errors to find a suitable catch all variant for errors which don't belong to any of the given protocol specific error codes. https://github.com/ethereum-optimism/specs/blob/main/specs/interop/supervisor.md#protocol-specific-error-codes

Some codes seem to be only used internally by Go implementation, for example this appears to be the case for

• ITER_STOP https://github.com/ethereum-optimism/specs/blob/main/specs/interop/supervisor.md#-321100-out_of_scope (needs investigation to confirm if this is only used internally) Others are general to any protocol and not specifically related to xmessage validation
• UNINITIALIZED_CHAIN_DATABASE https://github.com/ethereum-optimism/specs/blob/main/specs/interop/supervisor.md#-320400-uninitialized_chain_database
• CANNOT_GET_PARENT_OF_FIRST_BLOCK_IN_DB https://github.com/ethereum-optimism/specs/blob/main/specs/interop/supervisor.md#-321200-cannot_get_parent_of_first_block_in_db

The list should only contain errors specific to the interop consensus checks implemented by the supervisor.

Ref https://github.com/paradigmxyz/reth/pull/15944#discussion_r2062943685

[rose2221]

would like to work on this!

[emhane]

ref https://github.com/ethereum-optimism/specs/issues/660