Perf/valuekeccak snap code

[asdacap]

• Swap Keccak with ValueKeccak in snap codes.
• Dissappointingly does not reliably increase or decrease memory alloc or cpu.

Changes

• Swapped Keccak with ValueKeccak in snap handling code along with response and request model.
• Other minor change to reduce change needed to make this work.

Types of changes

What types of changes does your code introduce?

• Optimization
• Refactoring

Testing

Requires testing

• Yes
• No

If yes, did you write tests?

• Yes
• No: Modified tests though.

Notes on testing

• Can finish snap/state sync just fine. Did not reliably affect performance.

[benaadams]

Dissappointingly does not reliably increase or decrease memory alloc or cpu.

The effects will be on the otherside by decreasing the number of allocated objects the GC needs to consider when cleaning up memory, so hopefully lower GC times