Rule to check for an open without a close

[ericwb]

Is your feature request related to a problem? Please describe.
A user could accidentally open files via os.open or open and forget to call close if not within a with statement.

Not calling close can result in leaked file descriptors.

Describe the solution you'd like
Create a new rule to check for open without a subsequent close if not within a with statement.

Describe alternatives you've considered
n/a

Additional context
https://docs.python.org/3/library/functions.html#open

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