add worker-go template

_templates/cloudflare/worker-go/.gitignore

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+build

_templates/cloudflare/worker-go/Makefile

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+.PHONY: dev
+dev:
+	wrangler dev
+
+.PHONY: build
+build:
+	go run github.com/syumai/workers/cmd/workers-assets-gen@latest -mode=go
+	GOOS=js GOARCH=wasm go build -o ./build/app.wasm .
+
+.PHONY: publish
+publish:
+	wrangler publish

_templates/cloudflare/worker-go/README.md

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+# worker-template-go
+
+- A template for starting a Cloudflare Worker project with Go.
+- This template uses [`workers`](https://github.com/syumai/workers) package to run an HTTP server.
+
+## Notice
+
+- A free plan Cloudflare Workers only accepts ~1MB sized workers.
+  - Go Wasm binaries easily exceeds this limit, so **you'll need to use a paid plan of Cloudflare Workers** (which accepts ~5MB sized workers).
+
+## Usage
+
+- `main.go` includes simple HTTP server implementation. Feel free to edit this code and implement your own HTTP server.
+
+## Requirements
+
+- Node.js
+- [wrangler](https://developers.cloudflare.com/workers/wrangler/)
+  - just run `npm install -g wrangler`
+- Go
+
+## Getting Started
+
+```
+$ wrangler generate my-app syumai/workers/_templates/cloudflare/worker-go
+$ cd my-app
+$ go mod init
+$ go mod tidy
+$ make dev # start running dev server
+$ curl http://localhost:8787/hello
+Hello!
+```
+
+- To change worker name, please edit `name` property in `wrangler.toml`.
+
+## Development
+
+### Commands
+
+```
+make dev     # run dev server
+make build   # build Go Wasm binary
+make publish # publish worker
+```
+
+### Testing dev server
+
+- Just send HTTP request using some tools like curl.
+
+```
+$ curl http://localhost:8787/hello
+Hello!
+```
+
+```
+$ curl -X POST -d "test message" http://localhost:8787/echo
+test message
+```

_templates/cloudflare/worker-go/main.go

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+package main
+
+import (
+	"bytes"
+	"io"
+	"net/http"
+
+	"github.com/syumai/workers"
+)
+
+func main() {
+	http.HandleFunc("/hello", func(w http.ResponseWriter, req *http.Request) {
+		msg := "Hello!"
+		w.Write([]byte(msg))
+	})
+	http.HandleFunc("/echo", func(w http.ResponseWriter, req *http.Request) {
+		b, err := io.ReadAll(req.Body)
+		if err != nil {
+			panic(err)
+		}
+		io.Copy(w, bytes.NewReader(b))
+	})
+	workers.Serve(nil) // use http.DefaultServeMux
+}

_templates/cloudflare/worker-go/wrangler.toml

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+name = "go-worker"
+main = "./build/worker.mjs"
+compatibility_date = "2022-11-19"
+compatibility_flags = [
+    "streams_enable_constructors"
+]
+
+[build]
+command = "make build"