[Non-Review] Add runtime-aware gas cost accounting

[Jim8y]

this pr is experimental for future works, do not review.

Motivation

The current fee schedule applies static, worst-case prices to opcodes and syscalls. Real workloads
show wide variance in CPU, memory, and storage usage, so contracts can significantly underpay (e.g.,
concatenating big buffers or emitting large notifications) while attackers can exploit cheap opcodes
to force expensive work. We also lack a policy knob to tune in-memory allocations independently of
storage writes.

Summary

• Introduce a ResourceCost model and hook it into the VM so opcodes, syscalls, and native methods
  charge for actual CPU, transient memory, and persistent storage.
• Meter inline push-byte opcodes, data-copy primitives, iterators, runtime logging, storage APIs, and
  native contract entry points proportionally to the data they touch.
• Expose a MemoryFeeFactor managed by the Policy contract and surface it through RPC, enabling
  governance to tune transient memory pricing.
• Update docs/tests to reflect the dynamic schedule and add regression coverage for the new pricing
  rules.