…ly-business-survey-results into 377-main-script

* Create function to change datatypes

* Update config to use nested dictionary for column and data type

* Added test to verify functionality

* Added functionality to drop cols without deleting type

* Corrected function inputs

* Adding docstrings

* Corrected differences in types for reference

* Adding comments

* Modified main to test implementation

* Update to raise ValueError when datatypes are different

* Refactored to add functions to validate datatype inputs and if repeated cols have conflicting types

* Adding docstrings to validation functions

* Updated function to work with reference and period as index. Currently resets index but looking into avoiding this

* Cleaned up function and documentation

* Remove print statement

* Update module path to pass unit tests

merging main to fix conflicts