Add valkey client cli application

[adam-fowler]

To avoid having to keep hacking tests to verify command output, I've added a small CLI application for communicating with Valkey

[github-actions]

✅ Pull request no significant performance differences ✅

Summary

New baseline 'pull_request' is WITHIN the 'main' baseline thresholds.

Full Benchmark Comparison

Comparing results between 'main' and 'pull_request'

Host '91f3c2f8b4bd' with 4 'x86_64' processors with 15 GB memory, running:
#17~24.04.1-Ubuntu SMP Mon Dec  1 20:10:50 UTC 2025

ValkeyBenchmarks

Client: GET benchmark metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	51	53	55	57	57	57	57	6
pull_request	51	53	54	56	59	59	59	6
Δ	0	0	-1	-1	2	2	2	0
Improvement %	0	0	2	2	-4	-4	-4	0

Client: GET benchmark | parallel 20 | 20 concurrent connections metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	53	55	57	60	61	64	64	25
pull_request	51	55	57	59	61	64	64	25
Δ	-2	0	0	-1	0	0	0	0
Improvement %	4	0	0	2	0	0	0	0

Connection: GET benchmark metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	4	4	4	4	4	4	4	8
pull_request	4	4	4	4	4	4	4	8
Δ	0	0	0	0	0	0	0	0
Improvement %	0	0	0	0	0	0	0	0

Connection: GET benchmark – NoOpTracer metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	4	7	8	9	9	9	9	7
pull_request	4	7	8	9	9	9	9	8
Δ	0	0	0	0	0	0	0	1
Improvement %	0	0	0	0	0	0	0	1

Connection: Pipeline array benchmark metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	14	18	25	29	29	29	29	7
pull_request	14	18	25	29	29	29	29	7
Δ	0	0	0	0	0	0	0	0
Improvement %	0	0	0	0	0	0	0	0

Connection: Pipeline benchmark metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	7	24	24	25	25	25	25	7
pull_request	7	24	24	25	25	25	25	7
Δ	0	0	0	0	0	0	0	0
Improvement %	0	0	0	0	0	0	0	0

HashSlot – {user}.whatever metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	0	0	0	0	0	0	0	18
pull_request	0	0	0	0	0	0	0	18
Δ	0	0	0	0	0	0	0	0
Improvement %	0	0	0	0	0	0	0	0

ValkeyCommandEncoder – Command with 7 words metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	0	0	0	0	0	0	0	821
pull_request	0	0	0	0	0	0	0	823
Δ	0	0	0	0	0	0	0	2
Improvement %	0	0	0	0	0	0	0	2

ValkeyCommandEncoder – Simple GET metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	0	0	0	0	0	0	0	1979
pull_request	0	0	0	0	0	0	0	1973
Δ	0	0	0	0	0	0	0	-6
Improvement %	0	0	0	0	0	0	0	-6

ValkeyCommandEncoder – Simple MGET 15 keys metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	0	0	0	0	0	0	0	375
pull_request	0	0	0	0	0	0	0	378
Δ	0	0	0	0	0	0	0	3
Improvement %	0	0	0	0	0	0	0	3

[nilanshu-sharma]

Looks good, just some minor comments

[nilanshu-sharma]

Mostly looks good, added a comment to potentially simplify the logic.