Improve Loading Custom Files

[colin99d]

Description

Fixes: #4280

The error above will STILL happen because we still NEED to include a ticker symbol, but I did improve:

• Allow --help to be used with load
• Allow xlsx files to be used

How has this been tested?

• Please describe the tests that you ran to verify your changes.
• Provide instructions so we can reproduce.
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• Make sure affected commands still run in terminal
• Ensure the SDK still works
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Checklist:

• I have adhered to the GitFlow naming convention and my branch name is in the format of feature/feature-name or hotfix/hotfix-name.
• Update our documentation following these guidelines. Update any user guides that are affected by the changes.
• Update our tests following these guidelines.
• Make sure you are following our CONTRIBUTING guidelines.
• If a feature was added make sure to add it to the corresponding integration test script.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.

[jmaslek]

nice

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@18b82a7). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #4504   +/-   ##
==========================================
  Coverage           ?   54.81%           
==========================================
  Files              ?      590           
  Lines              ?    53146           
  Branches           ?        0           
==========================================
  Hits               ?    29130           
  Misses             ?    24016           
  Partials           ?        0           

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