Add minimum support for static credential stores to admin UI (#1145)

* cred store read ability

* filter out static cred stores and credentials from credential libraries

* chore: 🤖 finish up minimum static cred store support

Co-authored-by: dharini <dharini@hashicorp.com>

addons/api/addon/models/credential-store.js

@@ -31,4 +31,9 @@ export default class CredentialStoreModel extends GeneratedCredentialStoreModel
    * @type {boolean}
    */
   @equal('type', 'vault') isVault;
+
+  /**
+   * @type {boolean}
+   */
+  @equal('type', 'static') isStatic;
 }