feat!(tools/looker): Factor Looker LookML development tools into their own prebuilt config (googleapis#2559)

## Description

In order to reduce the bloat of tools, users who do not need LookML
development tools can use `--prebuilt looker`, while users that need the
full suite of tools can use `--prebuilt looker,looker-dev`

## PR Checklist

> Thank you for opening a Pull Request! Before submitting your PR, there
are a
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- [x] Make sure you reviewed

[CONTRIBUTING.md](https://github.com/googleapis/genai-toolbox/blob/main/CONTRIBUTING.md)
- [ ] Make sure to open an issue as a

[bug/issue](https://github.com/googleapis/genai-toolbox/issues/new/choose)
  before writing your code! That way we can discuss the change, evaluate
  designs, and agree on the general idea
- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)
- [x] Make sure to add `!` if this involve a breaking change

Author: drstrangelooker

cmd/internal/tools_file_test.go

@@ -1478,6 +1478,7 @@ func TestPrebuiltTools(t *testing.T) {
 	mysql_config, _ := prebuiltconfigs.Get("mysql")
 	mssql_config, _ := prebuiltconfigs.Get("mssql")
 	looker_config, _ := prebuiltconfigs.Get("looker")
+	looker_dev_config, _ := prebuiltconfigs.Get("looker-dev")
 	lookerca_config, _ := prebuiltconfigs.Get("looker-conversational-analytics")
 	postgresconfig, _ := prebuiltconfigs.Get("postgres")
 	spanner_config, _ := prebuiltconfigs.Get("spanner")
@@ -1792,7 +1793,17 @@ func TestPrebuiltTools(t *testing.T) {
 			wantToolset: server.ToolsetConfigs{
 				"looker_tools": tools.ToolsetConfig{
 					Name:      "looker_tools",
-					ToolNames: []string{"get_models", "get_explores", "get_dimensions", "get_measures", "get_filters", "get_parameters", "query", "query_sql", "query_url", "get_looks", "run_look", "make_look", "get_dashboards", "run_dashboard", "make_dashboard", "add_dashboard_element", "add_dashboard_filter", "generate_embed_url", "health_pulse", "health_analyze", "health_vacuum", "dev_mode", "get_projects", "get_project_files", "get_project_file", "create_project_file", "update_project_file", "delete_project_file", "get_project_directories", "create_project_directory", "delete_project_directory", "validate_project", "get_connections", "get_connection_schemas", "get_connection_databases", "get_connection_tables", "get_connection_table_columns", "get_lookml_tests", "run_lookml_tests", "create_view_from_table"},
+					ToolNames: []string{"get_models", "get_explores", "get_dimensions", "get_measures", "get_filters", "get_parameters", "query", "query_sql", "query_url", "get_looks", "run_look", "make_look", "get_dashboards", "run_dashboard", "make_dashboard", "add_dashboard_element", "add_dashboard_filter", "generate_embed_url"},
+				},
+			},
+		},
+		{
+			name: "looker dev prebuilt tools",
+			in:   looker_dev_config,
+			wantToolset: server.ToolsetConfigs{
+				"looker_dev_tools": tools.ToolsetConfig{
+					Name:      "looker_dev_tools",
+					ToolNames: []string{"health_pulse", "health_analyze", "health_vacuum", "dev_mode", "get_projects", "get_project_files", "get_project_file", "create_project_file", "update_project_file", "delete_project_file", "get_project_directories", "create_project_directory", "delete_project_directory", "validate_project", "get_connections", "get_connection_schemas", "get_connection_databases", "get_connection_tables", "get_connection_table_columns", "get_lookml_tests", "run_lookml_tests", "create_view_from_table"},
 				},
 			},
 		},

docs/en/reference/prebuilt-tools.md

@@ -547,6 +547,23 @@ See [Usage Examples](../reference/cli.md#examples).
     *   `add_dashboard_element`: Adds a tile to a dashboard.
     *   `add_dashboard_filter`: Adds a filter to a dashboard.
     *   `generate_embed_url`: Generate an embed url for content.
+
+## Looker Dev
+
+*   `--prebuilt` value: `looker-dev`
+*   **Environment Variables:**
+    *   `LOOKER_BASE_URL`: The URL of your Looker instance.
+    *   `LOOKER_CLIENT_ID`: The client ID for the Looker API.
+    *   `LOOKER_CLIENT_SECRET`: The client secret for the Looker API.
+    *   `LOOKER_VERIFY_SSL`: Whether to verify SSL certificates.
+    *   `LOOKER_USE_CLIENT_OAUTH`: Whether to use OAuth for authentication.
+    *   `LOOKER_SHOW_HIDDEN_MODELS`: Whether to show hidden models.
+    *   `LOOKER_SHOW_HIDDEN_EXPLORES`: Whether to show hidden explores.
+    *   `LOOKER_SHOW_HIDDEN_FIELDS`: Whether to show hidden fields.
+*   **Permissions:**
+    *   A Looker account with permissions to access the desired projects
+        and LookML is required.
+*   **Tools:**
     *   `health_pulse`: Test the health of a Looker instance.
     *   `health_analyze`: Analyze the LookML usage of a Looker instance.
     *   `health_vacuum`: Suggest LookML elements that can be removed.

internal/prebuiltconfigs/prebuiltconfigs_test.go

@@ -42,6 +42,7 @@ var expectedToolSources = []string{
 	"elasticsearch",
 	"firestore",
 	"looker-conversational-analytics",
+	"looker-dev",
 	"looker",
 	"mindsdb",
 	"mssql",