AADSASCredentialWithEnvironmentVars configures the TokenProvider using the environment variables available 1.

NewAADSASCredential constructs a SAS token provider for Azure storage using Azure Active Directory credentials canonicalizedResource should be formed as described here: https://docs.microsoft.com/en-us/rest/api/storagerp/storageaccounts/listservicesas.

NewStorageLeaserCheckpointer builds an Azure Storage Leaser Checkpointer which handles leasing and checkpointing for the EventProcessorHost.