feat: relay meta key-values from src messages to target

fix: use lastSendID instead of currCandiate in lag checks

refactor: spawn 1 relay per configured topic

fix: record offset for src topic instead of target

fix: record offset for src topic instead of target

feat: make target channel buffer configurable

profile: use local franz-go changes for benchmarks

chore: test goreleaser

chore: test goreleaser

chore: test goreleaser