Add `context` method to request context #15641

Job	Run time
Jmh CachedDateHeaderBenchmark	0s
Build and Test (ubuntu-latest, 2.12.18, graal_graalvm@17)	7m 31s
Build and Test (ubuntu-latest, 2.12.18, temurin@8)	7m 8s
Jmh CookieDecodeBenchmark	0s
Build and Test (ubuntu-latest, 2.13.12, graal_graalvm@17)	10m 56s
Jmh EndpointBenchmark	0s
Build and Test (ubuntu-latest, 2.13.12, temurin@8)	10m 15s
Build and Test (ubuntu-latest, 3.3.1, graal_graalvm@17)	7m 8s
Build and Test (ubuntu-latest, 3.3.1, temurin@8)	6m 31s
Jmh HttpCollectEval	0s
Jmh HttpCombineEval	0s
Jmh HttpNestedFlatMapEval	0s
Jmh HttpRouteTextPerf	0s
Jmh ProbeContentTypeBenchmark	0s
Jmh SchemeDecodeBenchmark	0s
Jmh ServerInboundHandlerBenchmark	0s
Jmh UtilBenchmark	0s
Unsafe Scoverage (ubuntu-latest, 2.13.12, temurin@8)	5m 14s
Release Drafter (ubuntu-latest, 2.13.10, temurin@8)	8s
Cache Jmh benchmarks	0s
Publish Artifacts	0s
	54m 51s

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