SecretStore: generating and retrieving decryption keys via service contract (#8029)

* SecretStore: started document keys generation via contract

* fixed Cargo.lock

* SecretStore: doc key contract gen tests

* SecretStore: fixed log parsing

* SecretStore: flush

* SecretStore: secretstore_generateDocumentKey RPC

* SecretStore: return encrypted_key from secretstore_generateDocumentKey

* prepare to GenerateDocKey -> StoreDocKey

* SecretStore: ability to identify requester via Public/Address

* SecretStore: store author address instead of public in db

* flush

* SecretStore: flush

* SecretStore: fixed test

* SecretStore: flush

* SecretStore: flush

* SecretStore: flush

* SecretStore: flush

* SecretStore: start async generation session

* SecretStore: process StoreDocumentKey service tasks

* SecretStore: flush

* SecretStore: update service contact ABI

* SecretStore: flush

* SecretStore: flush

* SecretStore: fixed event

* SecretStore: flush

* SecretStore: fixed tests

* SecretStore: fix broadcast shadows decryption

* SecretStore: finally decryption via service contract works

* SecretStore: fix for updated contract

* SecretStore: restored pending requests reqding

* SecretStore: fixed some TODOs

* SecretStore: OnChainServiceContractAggregate

* SecretStore: different names for different contracts types

* SecretStore: updated contracts interfaces

* SecretStore: utilize aggregate service contract

* fixed compilation

* SecretStore: fixes for updated contract

* SecretStore: service fixes after testing

* fixed cli test compilation

* SecretStore: decryption_session_origin_is_known_to_all_initialized_nodes

* SecretStore: added new contract listener tests

* SecretStore: session_listener_works

* removed optional TODO

* SecretStore: fixed KeyServer shutdown

* fixed warn + grumble

* const durations