refactor: Generated client and data types from korrel8r spec.

Need to extend the korrel8r client, would like to use a swagger/openapi code generator with the
korrel8r swagger spec to make it easy to keep up with future changes.

Here is one possible generated client.
There are several possibilities, requesting feedback:

1. Use this generated client as-is to replace the existing client and cancellablefetch
2. Use only the generated model/ with the existing client.
3. Use some other generator (please suggest which one)

Other changes:
- Add custom headers by creating and using a named client
- Fix default api domain for API calls to include korrel8r api path
- Update useKorrel8r to use new format
- Fix error handling using new type
- Replace query.types with generated client/model types.

Author: alanconway

Makefile

@@ -62,3 +62,11 @@ deploy:	test-frontend		## Build and push image, reinstall on cluster using helm.
 	helm uninstall troubleshooting-panel-console-plugin -n troubleshooting-panel-console-plugin || true
 	PUSH=1 scripts/build-image.sh
 	helm install troubleshooting-panel-console-plugin charts/openshift-console-plugin -n troubleshooting-panel-console-plugin --create-namespace --set plugin.image=$(IMAGE)
+
+## Code generation
+gen-client: web/src/korrel8r/client
+
+# NOTE: copied from https://github.com/korrel8r/korrel8r/blob/main/pkg/rest/docs/swagger.json
+web/src/korrel8r/client: korrel8r/swagger.json
+	cd web && npx openapi-typescript-codegen --input ../$< --output ../$@ --name Korrel8rClient
+	@touch $@