feat: add env:*

[lxsmnsyc]

This PR adds the env:server and env:client modules

// Loads SERVER_* from .env
// Throws and omits all detected variables on client runtime
import { SERVER_EXAMPLE } from 'env:server';

console.log(SERVER_EXAMPLE);

// Loads CLIENT_* from .env
import { CLIENT_EXAMPLE } from 'env:client';

console.log(CLIENT_EXAMPLE);

// Dynamically loads environment variables (only on server)
import env from 'env:server/runtime';

console.log(env.NODE_ENV);

closes #2113

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commit: 7415042

[yinonburgansky]

Can we error on build-time, instead of run-time?
Maybe if it is done after the server-function & tree-shake