Feat: Proxy aware chain extensions

[LandynDev]

Description

I noticed that the V1 chain extensions aren't proxy aware
Functions like TransferStakeV1 use env.caller() directly as the origin - https://github.com/opentensor/subtensor/blob/main/chain-extensions/src/lib.rs#L245

If I'm understanding this right, it means the contract must be the coldkey that owns the stake and proxy relationships aren't checked. Even if a contract has valid proxy permissions, it is forced to use call_runtime with Proxy::proxy wrapping instead of chain extensions b/c of this.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe):

Breaking Change

This PR does not create a breaking change.
This introduces a new chain extension to wrap runtime calls with correct proxy perms.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have run ./scripts/fix_rust.sh to ensure my code is formatted and linted correctly
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Screenshots

Unit Tests:

Local E2E tests: ink! contract using new ProxyCall chain extension

The solution cli command maps to a smart contract function that will use the new proxy_call chain extension in order to transfer_stake of the bounty amount to the miner. (Notice miner has no balance before)

Can see here that transfer_stake succeeded as miners wallet balance received the transfer. Shows that these changes now allow the contract to act on behalf of its delegated permissions via chain extension

Additional Notes

[open-junius]

Should we check other ProxyType like Any also enable the add_stake call.

[open-junius]

All V2 extensions are not the upgrade or replace of V1. Could use the name like proxy_xxx.
Do you consider use the unique extension to implement them all. like proxy_execute(real_coldkey: AccountId, call: RuntimeCall). like in EVM precompile https://github.com/opentensor/subtensor/blob/main/precompiles/src/proxy.rs#L146.

[LandynDev]

All V2 extensions are not the upgrade or replace of V1. Could use the name like proxy_xxx. Do you consider use the unique extension to implement them all. like proxy_execute(real_coldkey: AccountId, call: RuntimeCall). like in EVM precompile https://github.com/opentensor/subtensor/blob/main/precompiles/src/proxy.rs#L146.

Went ahead and went this direction, was simplest.
Updated PR descr. with added testing from these simplified changes
Thanks for the review