Derive returns the AccountIdentifier associated with a public key. Blockchains that require an on-chain action to create an account should not implement this method.
ConstructionDeriveRequest is passed to the /construction/derive
endpoint. Network is provided in the request because some blockchains have different address formats for different networks. Metadata is provided in the request because some blockchains allow for multiple address types (i.e. different address for validators vs normal accounts).