fix(NODE-6241): allow Binary as local kms provider key for auto encryption (#4165)

Author: baileympearson

src/client-side-encryption/auto_encrypter.ts

@@ -26,85 +26,7 @@ export interface AutoEncryptionOptions {
   /** The namespace where keys are stored in the key vault */
   keyVaultNamespace?: string;
   /** Configuration options that are used by specific KMS providers during key generation, encryption, and decryption. */
-  kmsProviders?: {
-    /** Configuration options for using 'aws' as your KMS provider */
-    aws?:
-      | {
-          /** The access key used for the AWS KMS provider */
-          accessKeyId: string;
-          /** The secret access key used for the AWS KMS provider */
-          secretAccessKey: string;
-          /**
-           * An optional AWS session token that will be used as the
-           * X-Amz-Security-Token header for AWS requests.
-           */
-          sessionToken?: string;
-        }
-      | Record<string, never>;
-    /** Configuration options for using 'local' as your KMS provider */
-    local?: {
-      /**
-       * The master key used to encrypt/decrypt data keys.
-       * A 96-byte long Buffer or base64 encoded string.
-       */
-      key: Buffer | string;
-    };
-    /** Configuration options for using 'azure' as your KMS provider */
-    azure?:
-      | {
-          /** The tenant ID identifies the organization for the account */
-          tenantId: string;
-          /** The client ID to authenticate a registered application */
-          clientId: string;
-          /** The client secret to authenticate a registered application */
-          clientSecret: string;
-          /**
-           * If present, a host with optional port. E.g. "example.com" or "example.com:443".
-           * This is optional, and only needed if customer is using a non-commercial Azure instance
-           * (e.g. a government or China account, which use different URLs).
-           * Defaults to "login.microsoftonline.com"
-           */
-          identityPlatformEndpoint?: string | undefined;
-        }
-      | {
-          /**
-           * If present, an access token to authenticate with Azure.
-           */
-          accessToken: string;
-        }
-      | Record<string, never>;
-    /** Configuration options for using 'gcp' as your KMS provider */
-    gcp?:
-      | {
-          /** The service account email to authenticate */
-          email: string;
-          /** A PKCS#8 encrypted key. This can either be a base64 string or a binary representation */
-          privateKey: string | Buffer;
-          /**
-           * If present, a host with optional port. E.g. "example.com" or "example.com:443".
-           * Defaults to "oauth2.googleapis.com"
-           */
-          endpoint?: string | undefined;
-        }
-      | {
-          /**
-           * If present, an access token to authenticate with GCP.
-           */
-          accessToken: string;
-        }
-      | Record<string, never>;
-    /**
-     * Configuration options for using 'kmip' as your KMS provider
-     */
-    kmip?: {
-      /**
-       * The output endpoint string.
-       * The endpoint consists of a hostname and port separated by a colon.
-       * E.g. "example.com:123". A port is always present.
-       */
-      endpoint?: string;
-    };
-  };
+  kmsProviders?: KMSProviders;
   /**
    * A map of namespaces to a local JSON schema for encryption
    *