[DF] Remove DaskTableProvider struct `table_name` member

[jdye64]

Is your feature request related to a problem? Please describe. As a work around to a Datafusion limitation a private member, table_name was introduced to the DaskTableProvider in table.rs. This member is manually maintained and has the possibility to accidentally introduce errors. A PR is already open to address this limitation.

Describe the solution you'd like Once that PR is merged we need to update table.rs to remove the member and adjust the logic that acquires the name of the table for the TableScan operation to use the newly introduced field.

Describe alternatives you've considered None

Additional context None