Enable and configure the maximum change rate adjustment feature for vToken exchange rates

| vToken | Expected APY | Period(Block) | Maximum Change Rate Limit |
|--------|--------------|--------|--------------------------|
| vKSM   | 13.00%       | 14400  | 0.1068%                  |
| vMOVR  | 17.00%       | 14400  | 0.1397%                  |

vToken exchange rates configuration

candidates

members

proficients

fellows

senior_fellows

experts

senior_experts

masters

senior_masters

grand_masters

root

whitelisted_caller

fellowship_admin

referendum_canceller

referendum_killer

liquid_staking

system_staking_admin

salp_admin

treasury_spend

delegated_voting_admin