[`api`] Logging and error reporting

[koistya]

• Tweak the logging compatibility with Google Cloud Functions (2nd gen)
• Let Google Cloud Logging pick up log messages and errors from stdin / stdout as a simple solution
• Add ctx.log(...) helper function to Context available from GraphQL resolver functions
• Make GraphQL parameters (query name, variables) available via Context (ctx.params)
• Exclude Node.js native modules and Express related stuff from the error stack traces in development mode

Usage Example

From within the GraphQL type resolvers:

{
  type: UserType,
  resolve(self, args, ctx) {
    ctx.log("INFO", "Fetching user account.");

    try {
      /* .... */
    } catch (err) {
      ctx.log("ERROR", err);
    }
  }
}

Or, from anywhere within the Node.js/Express app:

import { log } from "./core";

app.get("/example", (req, res) => {
  log(req, res, "INFO", "Hello from Express app.");
  ...
});

Reference https://cloud.google.com/functions/docs/monitoring/logging