Test unique and order `transaction_id` (condenser_api::get_block method)

Corresponding schemas merge request: schemas!25 (merged)

Two tests have been added:

• test uniqueness of transaction_ids generated by wallet,
• test if transaction_ids order corresponds to transactions order.

Extend message_format_tests:

• check uniqueness transaction_ids in get_block methods (condenser and wallet_bridge APIs).

Related Issue: #367 (closed) Both tests are complementary to this: (!635 (merged)).