[wip] expose rgp into Move native context

[dariorussi]

Description

Reference gas price is now exposed to Move though through a non public native function. 3 functions are exposed non publicly and we should decide what to do: rgp(), gas_price() and gas_budget(). There is a question about the replace and replace_with_rgp native functions in Move. Talking with the team it may be possible to simplify that story a bit. I'll be playing with it.

We can go with something like this and exposing the public functions later or make a final decision on what the public surface of those functions should be and push once everything is in place

Test plan

Testing comes when we expose the function publicly in Move

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Release notes

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• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] gRPC:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:

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[MaxResnick]

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