DE-819 | bring back REQUEST_TIMEOUT as a class attribute

[aMahanna]

[Optional PR]

Unfortunately this is no longer supported, but we can achieve something similar with this PR (see the added test cases)

Current ways that we support setting request_timeout:

# 1
client_no_timeout = ArangoClient(request_timeout=None)

# 2
client_no_timeout = ArangoClient(http_client=DefaultHTTPClient(request_timeout=None))

# 3
class NoTimeoutHTTPClient(DefaultHTTPClient):
    REQUEST_TIMEOUT = None

    def __init__(self, *args, **kwargs):
        super().__init__(request_timeout=self.REQUEST_TIMEOUT, *args, **kwargs)

client_no_timeout = ArangoClient(http_client=NoTimeoutHTTPClient())

[aMahanna]

previously, the NoTimeoutHTTPClient with a class REQUEST_TIMEOUT would work without needing an __init__. This is PR basically introduces the ability to support REQUEST_TIMEOUT again, but with the exception of needing an __init__

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.95%. Comparing base (e44a3e8) to head (1bb4488).

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #344   +/-   ##
=======================================
  Coverage   95.95%   95.95%           
=======================================
  Files          26       26           
  Lines        4277     4278    +1     
=======================================
+ Hits         4104     4105    +1     
  Misses        173      173           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.