Perf improvement: json, json_middleware, json_middleware

[pr-benchmarks]

Scenario	Environment	Date	Old RPS	New RPS	Change	Deviation	StDev	Dependencies
json	Json Platform 13- Trends cobalt-hosted-lin	08/21/2026 08:33:21	491,228	966,090	96.67 % (474,862) 👍	2.47 σ	191,897.41	Changes Name Version Diff
json_middleware	Json 400k 13- Trends cobalt-hosted-lin	08/21/2026 08:52:02	12,229	22,225	81.73 % (9,995) 👍	2.34 σ	4,268.51	Changes Name Version Diff
json_middleware	Json 10k 13- Trends cobalt-hosted-lin	08/21/2026 08:52:57	190,904	363,192	90.25 % (172,288) 👍	2.60 σ	66,229.29	Changes Name Version Diff

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