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

| vToken | Expected APY | Period(Block) | Maximum Change Rate Limit |
|--------|--------------|--------|--------------------------|
| vDOT   | 12.00%       | 14400  | 0.0986%                  |
| vETH   | 2.80%        | 14400  | 0.0230%                  |
| vBNC   | 5.00%        | 14400  | 0.0411%                  |
| GLMR   | 10.00%       | 14400  | 0.0822%                  |
| vASTR  | 15.00%       | 14400  | 0.1233%                  |
| vMANTA | 10.00%       | 14400  | 0.0822%                  |


- **vDOT** can change up to 0.0986% every 14,400 blocks.
- **vETH** can change up to 0.0230% every 14,400 blocks.
- **vBNC** can change up to 0.0411% every 14,400 blocks.
- **GLMR** can change up to 0.0822% every 14,400 blocks.
- **vASTR** can change up to 0.1233% every 14,400 blocks.
- **vMANTA** can change up to 0.0822% every 14,400 blocks.

calls

Deciding

Submitted

DecisionDepositPlaced

DecisionStarted

senior_fellows

vToken exchange rates configuration

candidates

members

proficients

fellows

experts

senior_experts

masters

senior_masters

grand_masters

Origin commanded by any members of the Polkadot Fellowship (no Dan grade needed)

Origin commanded by rank 1 of the Polkadot Fellowship and with a success of 1

Origin commanded by rank 2 of the Polkadot Fellowship and with a success of 2

Origin commanded by Polkadot Fellows (3rd Dan fellows or greater)

Origin commanded by rank 4 of the Polkadot Fellowship and with a success of 4

Origin commanded by Polkadot Experts (5th Dan fellows or greater)

Origin commanded by rank 6 of the Polkadot Fellowship and with a success of 6

Origin commanded by Polkadot Masters (7th Dan fellows of greater)

Origin commanded by rank 8 of the Polkadot Fellowship and with a success of 8

Origin commanded by rank 9 of the Polkadot Fellowship and with a success of 9

vToken	Expected APY	Period(Block)	Maximum Change Rate Limit
vDOT	12.00%	14400	0.0986%
vETH	2.80%	14400	0.0230%
vBNC	5.00%	14400	0.0411%
GLMR	10.00%	14400	0.0822%
vASTR	15.00%	14400	0.1233%
vMANTA	10.00%	14400	0.0822%