Support TransactWriteItems in table

[dkraczkowski]

Description

Possible solution might be using a context to write multiple items to the table

References

• https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/transactions.html
• amano.Table

Test Cases

• Write data in a single transaction and assert changes in a table
• Make write data in a single transaction to fail and assert that table's data is unchanged
• Write data in a single transaction with a condition and assert changes in a table
• Write data in a single transaction with a condition in the way it fails and asssert table's data is unchanged