Provide performance benchmarks

[RobertCraigie]

Currently our performance will not stack up well with other Python ORMs, however we can't work on improving performance without having a baseline to work from.

We should also provide context for these benchmarks by also benchmarking other ORMs. We should include:

• SQLAlchemy
• Django
• Pewee
• Pony ORM
• SQLObject
• Tortoise ORM
• SQLModel

We could also base the benchmarks on these benchmarks: https://github.com/tortoise/orm-benchmarks

[RobertCraigie]

We could probably make use of: https://github.com/psf/pyperf

[RobertCraigie]

We should also benchmark using a mocked engine to make it easier to identify what performance improvements we can make and what improvements must be made on the Prisma side.

[RobertCraigie]

We could also consider using asv.