feat: add devcontainer (googleapis#8512)

* feat: add devcontainer for github codespaces

* feat: remove unwanted code

.devcontainer/Dockerfile

@@ -0,0 +1,10 @@
+ARG VARIANT="1-1.21-bullseye"
+FROM mcr.microsoft.com/devcontainers/go:${VARIANT}
+
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive
+
+RUN type -p curl >/dev/null || (apt-get install curl -y)
+
+
+# install gloud sdk
+RUN echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] http://packages.cloud.google.com/apt cloud-sdk main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list && curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key --keyring /usr/share/keyrings/cloud.google.gpg  add - && apt-get update -y && apt-get install google-cloud-cli -y

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/go
+{
+	"name": "Go 1.21.0",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "bash .devcontainer/postCreate.sh",
+	// Configure tool-specific properties.
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-azuretools.vscode-docker"
+			]
+		}
+	}
+}

.devcontainer/postCreate.sh

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+echo "Post Create Starting"
+
+go version
+go mod tidy