Add more CLI commands to make use of the RPC API

client/conn.go

cmd/iprep/dump.go

cmd/iprep/query.go

cmd/iprep/server.go

cmd/iprep/submit.go

cmd/iprep/tail.go

cmd/iprep/tail_test.go

go.mod

go.sum

submission/queue.go

vendor/github.com/beorn7/perks/LICENSE

vendor/github.com/beorn7/perks/quantile/exampledata.txt

vendor/github.com/beorn7/perks/quantile/stream.go

vendor/github.com/cespare/xxhash/v2/.travis.yml

vendor/github.com/cespare/xxhash/v2/LICENSE.txt

vendor/github.com/cespare/xxhash/v2/README.md

vendor/github.com/cespare/xxhash/v2/go.mod

vendor/github.com/cespare/xxhash/v2/go.sum

vendor/github.com/cespare/xxhash/v2/xxhash.go

vendor/github.com/cespare/xxhash/v2/xxhash_amd64.go