rename file and add initial interface

internal/infrastructure/connector/key.go

@@ -0,0 +1,21 @@
+package connector
+
+import (
+	"bytes"
+	"crypto_vault_service/internal/domain/keys"
+)
+
+// VaultConnector is an interface for interacting with key storages
+type VaultConnector interface {
+	// Upload uploads multiple files to Vault Storage and returns their metadata.
+	Upload(filePaths []string) ([]*keys.CryptoKeyMeta, error)
+
+	// Download retrieves a blob's content by its ID and name, and returns the data as a stream.
+	Download(blobId, blobName string) (*bytes.Buffer, error)
+
+	//
+	// Rotate()
+
+	// Delete deletes a blob from Vault Storage by its ID and Name, and returns any error encountered.
+	Delete(blobId, blobName string) error
+}