Adding benchmark for deserialize json & product value

[mamcx]

Description of Changes

Simple benches for deserializing json & product value, to mirror the ones for serialization.

Expected complexity level and risk

1

Testing

Describe any testing you've done, and any testing you'd like your reviewers to do,
so that you're confident that all the changes work as expected!

• Write a test you've completed here.
• Write a test you want a reviewer to do here, so they can check it off when they're satisfied.

[kazimuth]

👍