Add serverless_compute_id field to the config (#952)

## Changes
Adding `serverless_compute_id` field to the config following [the same
change](databricks/databricks-sdk-py#685) in
databricks-sdk-py

## Tests

- [x] `make test` passing
- [x] `make fmt` applied
- [ ] relevant integration tests applied

---------

Co-authored-by: Pieter Noordhuis <pcnoordhuis@gmail.com>

config/config.go

@@ -45,8 +45,9 @@ type Config struct {
 	// Databricks host (either of workspace endpoint or Accounts API endpoint)
 	Host string `name:"host" env:"DATABRICKS_HOST"`
 
-	ClusterID   string `name:"cluster_id" env:"DATABRICKS_CLUSTER_ID"`
-	WarehouseID string `name:"warehouse_id" env:"DATABRICKS_WAREHOUSE_ID"`
+	ClusterID           string `name:"cluster_id" env:"DATABRICKS_CLUSTER_ID"`
+	WarehouseID         string `name:"warehouse_id" env:"DATABRICKS_WAREHOUSE_ID"`
+	ServerlessComputeID string `name:"serverless_compute_id" env:"DATABRICKS_SERVERLESS_COMPUTE_ID"`
 
 	// URL of the metadata service that provides authentication credentials.
 	MetadataServiceURL string `name:"metadata_service_url" env:"DATABRICKS_METADATA_SERVICE_URL" auth:"metadata-service,sensitive"`