[Exporter] Add references for missing permissions/grants types (#4390)

## Changes
<!-- Summary of your changes that are easy to understand -->

There were missing references:

- permissions: model serving and vector search endpoints
- grants: service credentials

## Tests
<!-- 
How is this tested? Please see the checklist below and also describe any
other relevant tests
-->

- [x] `make test` run locally
- [ ] relevant change in `docs/` folder
- [ ] covered with integration tests in `internal/acceptance`
- [ ] using Go SDK
- [ ] using TF Plugin Framework

docs/resources/permissions.md

@@ -901,7 +901,7 @@ General Permissions API does not apply to access control for tables and they hav
 
 ## Data Access with Unity Catalog
 
-Initially in Unity Catalog all users have no access to data, which has to be later assigned through [databricks_grants](grants.md) resource.
+Initially in Unity Catalog all users have no access to data, which has to be later assigned through [databricks_grants](grants.md) or [databricks_grant](grant.md) resource.
 
 ## Argument Reference
 

exporter/importables.go

@@ -1156,6 +1156,8 @@ var resourcesMap map[string]importable = map[string]importable{
 			{Path: "registered_model_id", Resource: "databricks_mlflow_model"},
 			{Path: "experiment_id", Resource: "databricks_mlflow_experiment"},
 			{Path: "repo_id", Resource: "databricks_repo"},
+			{Path: "vector_search_endpoint_id", Resource: "databricks_vector_search_endpoint", Match: "endpoint_id"},
+			{Path: "serving_endpoint_id", Resource: "databricks_serving_endpoint", Match: "serving_endpoint_id"},
 			// TODO: can we fill _path component for it, and then match on user/SP home instead?
 			{Path: "directory_id", Resource: "databricks_directory", Match: "object_id"},
 			{Path: "notebook_id", Resource: "databricks_notebook", Match: "object_id"},
@@ -2918,6 +2920,7 @@ var resourcesMap map[string]importable = map[string]importable{
 			{Path: "model", Resource: "databricks_registered_model"},
 			{Path: "external_location", Resource: "databricks_external_location", Match: "name"},
 			{Path: "storage_credential", Resource: "databricks_storage_credential"},
+			{Path: "credential", Resource: "databricks_credential"},
 			// TODO: add similar matchers for users/groups/SPs on account level...
 			{Path: "grant.principal", Resource: "databricks_recipient", IsValidApproximation: isMatchingShareRecipient},
 			//	{Path: "", Resource: ""},