Rule to detect hardcoding of /tmp directory

[ericwb]

Is your feature request related to a problem? Please describe.
Implement the equivalent of B108 in Bandit.

Describe the solution you'd like
Detect creation or usage of /tmp instead of using Python's tempfile creation function.

Describe alternatives you've considered
n/a

Additional context
https://bandit.readthedocs.io/en/latest/plugins/b108_hardcoded_tmp_directory.html

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