NewProvider instantiates a StoreProvider.

NewTestStoreEnv construct a StoreEnv for testing.

ErrIllegalArgs is to be thrown by a store impl if the args passed are not allowed.

ErrIllegalCall is to be thrown by a store impl if the store does not expect a call to Prepare/Commit/InitLastCommittedBlock.

ErrOutOfRange is to be thrown for the request for the data that is not yet committed.

StoreEnv provides the store env for testing.

Provider provides handle to specific 'Store' that in turn manages private write sets for a ledger.

Store manages the permanent storage of private write sets for a ledger The expected use is such that - first the private data will be given to this store (via `Prepare` funtion) and then the block is appended to the block storage.