drop generic getters in paramManager

[Chris-Hibbert]

What is the Problem Being Solved?

paramManager has support for getting parameter values directly by name, and indirectly by type. The former is superior, and the latter should be dropped.

For instance, the AMM supports both E(amm.ammPublicFacet).getProtocolFee(); and E(amm.ammPublicFacet).getNat('ProtocolFee');. The former's type is known via typescript.

Description of the Design

Drop the generic methods. This will simplify a few interfaces.

Security Considerations

Just usability.

Test Plan

Unneeded.