[Fix] Add overwrite functionality to the BoxFileWriterClass

[ToneVDB]

Description

Add an overwrite flag to the BoxFileWriter class

Related Issue

Parially solves #89

Motivation and Context

When writing to box and the file already exists, you want to be able to overwrite the existing file with a new version

How Has This Been Tested?

This has been tested on databricks and box - when a file exists and doesn't, the writer does the right thing

Screenshots (if appropriate):

Types of changes

• Bug fix (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 change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.