feat: add transformObject hook

[samchungy]

I've kept it similar to the transform hook to allow for additional parameters should we wish to add them in the future.

Resolves #736

Checklist

• [x] run npm run test and npm run benchmark
• [x] tests and/or benchmarks are included
• [x] documentation is changed or added
• [x] commit message and code follows the Developer's Certification of Origin and the Code of conduct