Fix Exception Handling When Platform Sends Close (From Timeout)

[dvonthenen]

Proposed changes

This should address issue https://github.com/deepgram/deepgram-python-sdk/pull/305

Changes include:

• Moves self._socket check in __init__ up right as not to overwrite setting values
• Clean exit and consolidate using def signal_exit(self):

Tested with examples/streaming and also while receiving a timeout.

Types of changes

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• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update or tests (if none of the other choices apply)

Checklist

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• [x] I have read the CONTRIBUTING doc
• [ ] I have lint'ed all of my code using repo standards
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)

Further comments

NA

[dvonthenen]

This removes any unhandled exceptions from making it to the user... preserves the exception through an option in case someone is using that as a means of doing something higher up.