ClientWithIdentity
Represents a client that provides a default identity signer.
The identity is a TransactionSigner representing the wallet that owns things in the application — for instance, the authority over accounts, tokens, or other on-chain assets owned by the current user. Unlike ClientWithPayer, which describes the signer responsible for paying transaction fees and storage costs, the identity describes the signer whose assets the application is acting upon. In many apps, the payer and identity refer to the same signer, but they can differ — for example, when a service pays fees on behalf of a user.