fix: do not fallback evm address to starknet

[wa0x6e]

• Add more test for getFormattedAddress, as the logic can be confusing.
• Enforce 42 chars address as evm address (no fallback to starknet)
• Reject string not starting by Ox or OX as address

Those changes add more restriction on the address validation

before:

• 123 is a valid starknet address
• OXOOO... is a an invalid evm but valid starknet address

after:

• invalid evm address will not fallback, and considered as valid starknet address
• only process string starting by 0x