Add experimental `@inngest/test` package #2630

Job	Run time
eslint-plugin: Test	33s
Create examples test matrix	4s
inngest: Local API diff	32s
inngest: Lint	43s
inngest: Runtime tests (14)	1m 17s
inngest: Composite tests	53s
inngest: Runtime tests (16)	1m 14s
inngest: Dependency tests	38s
inngest: Dist tests	50s
inngest: Runtime tests (18)	1m 9s
inngest: Runtime tests (20)	1m 10s
middleware-encryption: Test	31s
inngest: Type tests (latest)	47s
inngest: Package	41s
inngest: Runtime tests (22)	1m 8s
inngest: Type tests (~5.5.0)	47s
inngest: Type tests (~5.4.0)	52s
inngest: Type tests (~5.3.0)	45s
inngest: Type tests (~5.2.0)	57s
inngest: Type tests (~5.1.0)	51s
inngest: Type tests (~5.0.0)	44s
inngest: Type tests (~4.9.0)	45s
inngest: Type tests (~4.8.0)	54s
inngest: Type tests (~4.7.0)	52s
Test examples (framework-astro)	1m 31s
Test examples (framework-express)	1m 15s
Test examples (framework-koa)	1m 22s
Test examples (framework-sveltekit)	1m 26s
Test examples (framework-nextjs-app-router)	1m 35s
Test examples (framework-google-functions-framework)	1m 19s
Test examples (framework-fastify)	1m 16s
Test examples (framework-nextjs-pages-router)	1m 33s
Test examples (bun)	1m 14s
Test examples (framework-hono)	1m 28s
Test examples (framework-nuxt)	1m 40s
Test examples (framework-remix)	1m 45s
Test examples (framework-remix, force)	1m 45s
Test examples (framework-nextjs-app-router, force)	1m 30s
	40m 16s

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