refactor: encapsulate cache as decorator

[mweberxyz]

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[github-actions]

Benchmark		Node 18 PR	Node 18 Base		Node 20 PR	Node 20 Base		Node 21 PR	Node 21 Base
express.js		7771	8871		8671	8983		9399	8783
fastify.js		42495	40895		44255	43775		44031	44735
fastify-art.js		9871	9847		11591	10399		9607	9591
fastify-dot.js		49311	48991		47423	49279		48031	49759
fastify-eta.js		27919	27727		30303	30127		36799	37407
fastify-pug.js		46911	45311		47135	47135		46335	46559
fastify-twig.js		30895	31551		38463	39871		40351	39711
fastify-liquid.js		6903	6887		7567	7603		8439	8295
fastify-mustache.js		32559	32831		33503	34591		35295	34559
fastify-nunjucks.js		42719	40575		44159	44063		42911	43167
fastify-ejs-async.js		44191	43487		45631	44575		45727	43775
fastify-ejs-minify.js		12631	12847		15415	15335		14407	14959
fastify-handlebars.js		25103	24783		26367	31183		31055	27647
fastify-ejs-local-layout.js		27263	27743		31039	31807		32207	31999
fastify-ejs-global-layout.js		34591	34559		40191	40959		40831	41823