[Tables] Enrich tables copy samples

[YalinLi0312]

We've added samples about copy a table from Tables storage table to Storage blob and vice versa. https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/tables/azure-data-tables/samples/sample_copy_table.py We still need to provide samples about:

• copy a table from Tables cosmos table to Storage blob (not sure, @annatisch please correct me if it's not necessary) Update: it's a similar way, we can explain it in comment.
• copy tables between Tables storage table and Tables cosmos table Since we will deprecate Tables storage eventually and encourage customers to use Tables cosmos, I think we just need to provide a sample of copy Tables storage table to Tables cosmos table. Update: this is a good start for Tables migration guideline.