Add `input.debug = true` for debugging purposes

[amaury1093]

Feature Request

Add an optional debug field in the request, which, if true, will output debug info in the output.

Problem

A lot of people wonder why an email verification fails. Add debugging info via the API will save debugging time.

Solution

{
   "to_email": "test@gmail.com",
+  "debug": true
}

Which, if set, will also add a new debug field in the response, which gives additional info about how Reacher performed the verification. Things like:

• [ ] how much time the whole verification took?
• [ ] how many SMTP connections did it make? 1, or 2 (to avoid greylisting), or 0 (using API or headless browser)
• [ ] the full SMTP handshake logs

Example:

{
 "is_reachable": "unknown",
  // -- snip --
 "debug": {
   "time_elapsed": 10539, // in ms
   "smtp": {
     "method": "smtp", // or "api" or "headless"
     // fields below will depend on "method" above
     "smtp_connections": 2,
     "logs": [
       ">> STARTTLS<CRLF>",
       "<< 220 TLS go ahead<CRLF>"
       // -- snip --
     ]
   }
}

Notes

For new contributors: This is a good issue to get to know the codebase. It's also possible to do this feature piecewise: a first good step might be to simply add the time_elapsed field