[perf] Runtime: Optimize gas counter by splitting burn_gas and used_gas

[evgenykuzyakov]

I’m thinking we should refactor GasCounter to split burn_gas and used_gas . Right now used_gas includes burn_gas which makes logic more complicated when we need to increment only burn_gas

This might save us 2X in the critical path, since used_gas increases are more rare than burn_gas.

The critical path in near-vm-logic is the call to host function gas(amount) from the VM as part of gas metering.

This change will require to touch most of the vm-logic host functions but will simplify the code.

[olonho]

Think it is to be done after #3038 is merged.