Combine with cacheable beacon proxy to make it upgradable

[BlinkyStitt]

Having upgradability and some immutables could be helpful for my current project. https://github.com/frangio/cacheable-beacon-proxy/blob/master/contracts/CacheableBeaconProxy.sol

[BlinkyStitt]

I've thought about it some more and I'm not sure how best to do this. Deploying the "cache" would be expensive since it clones the implementation and not the thin proxy. And I think multiple layers of delegatecall is probably not worth the gas cost.

[BlinkyStitt]

I think if we:

1. change https://github.com/frangio/cacheable-beacon-proxy/blob/master/contracts/CacheableBeaconProxy.sol#L92 to deploy a simple delegatecall proxy
2. change https://github.com/frangio/cacheable-beacon-proxy/blob/master/contracts/CacheableBeaconProxy.sol#L82 to include the extra data in the calldata

then it might work