For single-table use cases, make it frictionless to update Metadata

[npatki]

Problem Description

In an upcoming version of SDV, we will be consolidating the Multi and Single table metadata objects into a streamlined Metadata object. Effectively, this object is the same as multi-table, so it includes functions that are suited for detecting multiple tables at once.

However, if you have a single table, it should still be usable without adding much friction. Currently, all the Metadata updating functions require you to input a table name, which really isn't necessary when all you have is a single table.

Expected behavior

For all of the metadata update functions (listed below), make the table_name parameter optional. If necessary, this means we should move its position to be after all the required parameters.

Then update the functionality as follows:

• If there are multiple tables in the Metadata, a table_name should be provided. If it is not provided, throw an error.

Error: There are multiple tables in your metadata. Please specify a 'table_name' to use this function.

• But if there is only a single table in the Metadata, then it's ok if table_name is missing. Proceed with the desired functionality.

Additional context

Make the change for the following functions:

• get_column_names
• update_column
• update_columns
• update_columns_metadata
• add_column
• add_column_relationship
• set_primary_key
• remove_primary_key
• add_alternate_keys