More three simple examples

[Terminus-IMRC]

This PR adds these three more examples, which are mainly intended to measure TMU read/write performance:

• summation.py: Adds up 32-bit integers in an array, which measures TMU read performance.
• memset.py: Sets a single 32-bit value to an array, which measures TMU write performance.
• scopy.py: Copies an array, which measures TMU simultaneous read/write performance.

These examples run with the full eight QPUs, so the metrics can be seen as the upper bound of TMU performance.

[Terminus-IMRC]

Thank you for reviewing!