[FR] Allow Optional Schema Mapping for Sheets to Dataframe Method

[kmaphoenix]

Is your proposal related to a problem?

As a user who imports Google Sheets to Dataframe, I want the ability to specify the data schema that I'm providing so everything is not interpreted as object, or potentially misinterpreted.

Describe the solution you'd like

Provide an optional arg in sheets_to_dataframe called schema that has a default value of None.
A user can then provide a schema map of the column names and dtypes that they want for each column.

Under the hood, SCRAPI will handle the assignment of the dtypes when importing the Sheet to Dataframe.

Additional context

This would save downstream schema manipulation for tools, scripts, apps, etc.