fix(core): update normalize_by_pair to be optional

[noot]

Summary

update normalize_by_pair to be optional and fix default market map genesis.

Background

connect sidecar can now run without specifying a markets.json, can now just get the market map from the sequencer.

Changes

• update normalize_by_pair to be optional as it should be optional
• fix default market map genesis

Testing

ran connect sidecar locally; change sequencer gRPC port to 9090 and run:
./build/connect --port 8081

run sequencer+cometbft as normal, should see sidecar logs like:

{"level":"info","ts":"2024-12-04T15:38:30.423-0500","caller":"marketmap/fetcher.go:128","msg":"successfully fetched market map data from module; checking if market map has changed","pid":8547,"process":"oracle","fetcher":"marketmap_api"}