Avoid configuring root logger in RedisVL

[vishal-bala]

Closes #443

This PR updates the logger configuration helper for RedisVL to avoid configuring the root logger via logging.basicConfig. That operation was interfering with user-configured loggers, causing app logs to be emitted multiple times and making it trickier to hide RedisVL logs when running in production.

In its place, we now configure a NullHandler (mainly to avoid issues with loggers not having any handlers configured). This means that any RedisVL usage that expects logs to have a specific format must now configure that format for itself.

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[tylerhutcherson]

Makes sense. Any way to test this somehow? The issuer gave a reproducer that we could use to turn into a test case possibly capturing the stdout and comparing

[vishal-bala]

@tylerhutcherson Yup! There was an existing test for roughly the same case that I extended to test that we don't emit duplicated logs anymore (it's very similar to the reproducing steps the issuer mentioned - see changes to logger_interference_checker.py and the associated test)