chore: add serde to segment

[luffykai]

No description provided.

[codspeed-hq]

CodSpeed Walltime Performance Report

Merging #1749 will not alter performance

_{Comparing lunkai/segment-serde (2f72f9f) with feat/new-execution (9364d65)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 10 untouched benchmarks

[github-actions]

group	app.proof_time_ms	app.cycles	app.cells_used	leaf.proof_time_ms	leaf.cycles	leaf.cells_used
verify_fibair	(-185 [-14.8%]) 1,066	322,773	17,341,042	-	-	-
fibonacci	(-458 [-17.3%]) 2,197	1,500,277	50,589,503	-	-	-
regex	(-1223 [-15.6%]) 6,633	4,165,432	166,519,456	-	-	-
ecrecover	(+179 [+15.6%]) 1,327	(-14218 [-10.4%]) 122,000	(-548071 [-6.8%]) 7,542,191	-	-	-
pairing	(+28 [+0.6%]) 4,494	1,862,964	(+230956 [+0.2%]) 97,508,739	-	-	-

Commit: 2f72f9f

Benchmark Workflow

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #1749 will not alter performance

_{Comparing lunkai/segment-serde (2f72f9f) with feat/new-execution (9364d65)}

Summary

✅ 10 untouched benchmarks

[jonathanpwang]

note: we may want to just write a custom serializer to bytes