add __repr__ to schema class so a print() call is not needed to represent the schema

[Gerhardsa0]

Is your feature request related to a problem? Please describe

At the moment we need to call the print()-function if we want a short representation of the schema. Also each column creates a own line, which makes the output very long.

Desired solution

It should be possible to just call table.schema, which should create an output like this.

TableSchema: 
Column Count: 2
Columns: [(coulmn_name1, type1), (column_name2, type2)]

At the moment the Code looks like this: print(table.schema.__str__()) and creates the following output. -->

TableSchema: 
Column Count: 2
Columns: coulmn_name1, type1
         column_name2, type2

This will make the Useability with Notebooks better.

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