* 🎉 Add tokens to plugins API documentation
And add poc plugin example
* 📚 Document better the tokens value in plugins API
* 🔧 Refactor token validation schemas
* 🔧 Use automatic validation in token proxies
* 🔧 Use schemas to validate token creation
* 🔧 Use multi schema for token value
* 🔧 Use schema in token api methods
* 🐛 Fix review comments
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Co-authored-by: Andrey Antukh <niwi@niwi.nz>
