[ADD] external-request-timeout: It could wait for a long time

[moylop260]

Calling external request needs to use timeout in order to avoid waiting for a long time
It could be even worse if you have one or many records locked
then calling a requests it could accumulate a lot of locks and
the workers could be used for more time and the system could be down
waiting for release

You can even reproduce the case using deelay.me
e.g.

import requests
response = requests.get("https://deelay.me/5000/https://www.google.com")  # It will spend 5s

# Now using timeout
response = requests.get("https://deelay.me/5000/https://www.google.com", timeout=2)

# After 2s if the request doesn't have response it raises the following exception
# requests.exceptions.ReadTimeout: HTTPSConnectionPool(host='deelay.me', port=443): Read timed out. (read timeout=2)

# But if it responses <=1s it is fine
response = requests.get("https://deelay.me/1000/https://www.google.com", timeout=2)

Now you can test the same but using a bigger delay

You can define your custom methods using the parameter: --external_request_timeout_methods

The default methods are:
- http.client.HTTPConnection
- http.client.HTTPSConnection
- odoo.addons.iap.models.iap.jsonrpc
- requests.delete
- requests.get
- requests.head
- requests.options
- requests.patch
- requests.post
- requests.put
- requests.request
- serial.Serial
- smtplib.SMTP
- suds.client.Client