[BugFix] Handle space separated arguments

[hjoaquim]

1. Why? (1-3 sentences or a bullet point list):

   • CLI was not capable of proper handling of space separated arguments, even when using quotes or escape characters.

2. What? (1-3 sentences or a bullet point list):

   • Use shlex to handle the user's input.

3. Impact (1-2 sentences or a bullet point list):

   • Significant UX improvement, allowing users to use space separated arguments where applicable

4. Testing Done:

   • Use space separated options:
     • filings --symbol aapl --form_type "NT N-MFP" --provider fmp
     • filings --symbol aapl --form_type NT\ N-MFP --provider fmp

Before those would result in an choices error: "Choose from..."

5. Reviewer Notes (optional):

   • The examples above are illustrative and will most likely result in empty data error.