feat(protos): About protobuf structure design

[jacksoom]

Is your feature request related to a problem? Please describe.
protobuf file: proto/zetachain/zetacore/pkg/proofs/ethereum/ethereum.proto
Replace the array representation method with map.
Put/Delete/Has/Get Looks more suitable for map operation. Arrays is not a efficient structure

Describe the solution you'd like

message Proof {
  repeated bytes keys = 1;
  repeated bytes values = 2;
}

map

message Proof {
     map<bytes, bytes> proofs = 1; // key -> value
}

Describe alternatives you've considered
Null

Motivation and Context
Protobuf optimization

[lumtis]

It is generally advised not using maps in Cosmos SDK modules as iteration is not deterministic and can lead to consensus failiure.

[jacksoom]

It is generally advised not using maps in Cosmos SDK modules as iteration is not deterministic and can lead to consensus failiure.

Cool