Add ability to not use the cache

[aharwood9]

Description -

Creating temp folders for the caches doesn't work on AWS Lamdba. So I have added the ability to provide a prop to not cache the auth headers.

Changes -

• Add use_cache to LumaClient with a default to True to keep current behaviour
• Added a .gitignore with the general defaults. I can revert this if you don't want one

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[sxyu]

thanks!