* fix: Modify 'load' behavior to append data to existing sheet
Details:
- Added logic to detect existing sheet and append data if present.
- There is no direct way to append on the sheet, so I am reading the sheet to get the last row number and then writing after that row number.
Resolves: #5472
* Added --export option for exporting to a desired file in /econometrics menu
* Added a -f/--file option to provide the filename for export.
Made -t/--type and -f/--file mutually exclusive.
If -f is not given, -t is required and the filename will be generated based on the time and module.
* Revert `helper_funcs.py` to original state
* Made some arguments not required.
* Minor changes asked by @deeleeramone
* No sheet name
* black
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Co-authored-by: James Maslek <jmaslek11@gmail.com>
Co-authored-by: Danglewood <85772166+deeleeramone@users.noreply.github.com>