Add kuberay manifest as installation dependencies (#203)

* Add kuberay manifest as installation dependencies

1. Use helm template to generate manifests and repackage as kustomize package
2. Remove third-party folder and refactor to use corresponding crds
3. Update envoy gateway dependency folder structure

* Move resources files under templates folder

config/dependency/envoy-gateway/kustomization.yaml

@@ -0,0 +1,7 @@
+kind: Kustomization
+
+resources:
+- https://github.com/envoyproxy/gateway/releases/download/v1.1.0/install.yaml
+
+patches:
+- path: envoy_config_patch.yaml

config/dependency/kuberay/README.md

@@ -0,0 +1,9 @@
+## KubeRay upstream manifests
+
+Commands to export manifest from helm package. After you got manifest, copy to this folder.
+
+```shell
+helm template aibrix-kuberay-operator kuberay/kuberay-operator --namespace aibrix-system --version 1.2.1 --include-crds --set env[0].name=ENABLE_PROBES_INJECTION --set env[0].value=\"false\" --set fullnameOverride=aibrix-kuberay-operator --output-dir ./output
+```
+
+If you use zsh, please use `noglob helm ...` to skip the brace check.