Support NodeJS and Go functions (Cloud Functions Package)

[0xHericles]

Allow Cloud Functions to support multiple language runtimes

• • Node.js 6 (deprecated)
• • Node.js 8
• • Node.js 10 (Beta)
• • Go

Reference:

• https://cloud.google.com/functions/docs/concepts/exec
• https://cloud.google.com/sdk/gcloud/reference/functions/deploy#--runtime

[0xHericles]

@alexandreyy I'll be working on it. 🚀