feat: handle circular structure serialization

[leandro-costa-oliveira]

Problem

res.json in lib/response.js calls stringify which fails if a object with circular structure is passed.

This is pretty common when you have calls using axios lib, the axios errors include the response object which have circular structure. Since a bunch a libs rely on axios, this is a pretty common cause of issues.

Example of Stack Trace

Doing a soap call with routing-controllers on top of express, fails to parse the error.

TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'Agent'

--- property 'agent' closes the circle
    at JSON.stringify (<anonymous>)
    at stringify (/app/node_modules/express/lib/response.js:1034:12)
    at ServerResponse.json (/app/node_modules/express/lib/response.js:245:14)
    at ExpressDriver.handleError (/app/node_modules/routing-controllers/cjs/driver/express/ExpressDriver.js:351:26)
    at /app/node_modules/routing-controllers/cjs/RoutingControllers.js:115:36
    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)

Tests

Added tests in test/res.json and test/res.jsonp simulating the circular structure.