Add support for httpx in B113 (request_without_timeout)

[mkniewallner]

Is your feature request related to a problem? Please describe.
httpx has APIs that are really similar to requests. Currently, in B113 (request_without_timeout), bandit only checks that timeouts are set in requests, but not in httpx.

Describe the solution you'd like
Additionally to checking requests in B113, bandit could also check for requests without timeout in httpx.

Describe alternatives you've considered
Implementing a new rule, but since support for httpx has been added in #861, it would probably be more consistent to update the existing B113 rather than implementing a new rule.

Additional context
Implementation is in #1060, if you think that this would be useful to add.

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