add precompile to set proxy accounts by enum index (int)

[xavierlyu]

Is your feature request related to a problem? Please describe.

we want to be able to specify proxyType as any integer from within the EVM (e.g., via a precompile). it would be very useful to set any proxy type. (you can only set staking proxy right now)

Describe the solution you'd like

proxy.addProxy
proxy.removeProxy

Describe alternatives you've considered

No response

Additional context

No response