Describe the enhancement request

problem: in testnet, the current flow does not allow someone to send a tx via kakarot:

• precompute the starknet address of an EOA
• fund it using a starknet account
• send an EVM tx using that EOA

currently, one needs to manually call kakarot_core.deploy_externally_owned_account(EOA_EVM_ADDRESS)

Describe Preferred Solution

inside eth_send_raw_transaction, IF the relayer feature is on, IF the transaction is valid, IF the user's EOA account is not already deployed on starknet, THEN deploy for them