Enable trusted storage Data and Keys in TAs

[neithanmo]

This is documented in optee but has to be exposed through an API in the rust bindings(If needed). We need to use this keys for securing data either in REE(host) or TA.. Considering the memory limitations, all the generated data could be stored in the REE but protected under encryption with the TA privkey.

[Deleted user]

(initial) bindings are being worked on in feature/storage branch

interface over this for the application logic is under TEE/deps/ta-common crate of remotee-signer branch