[kotlin-server][javalin5] Add Javalin context to generated services #236

Job	Run time
Build Kotlin server (samples/server/petstore/kotlin-springboot)	1m 35s
Build Kotlin server (samples/server/petstore/kotlin-springboot-bigdecimal-default)	1m 23s
Build Kotlin server (samples/server/petstore/kotlin-springboot-delegate)	1m 20s
Build Kotlin server (samples/server/petstore/kotlin-springboot-modelMutable)	1m 34s
Build Kotlin server (samples/server/petstore/kotlin-springboot-reactive)	1m 23s
Build Kotlin server (samples/server/petstore/kotlin-springboot-source-swagger1)	1m 26s
Build Kotlin server (samples/server/petstore/kotlin-springboot-source-swagger2)	1m 25s
Build Kotlin server (samples/server/petstore/kotlin-springboot-springfox)	1m 34s
Build Kotlin server (samples/server/petstore/kotlin-server/ktor)	1m 30s
Build Kotlin server (samples/server/petstore/kotlin-server/jaxrs-spec)	53s
Build Kotlin server (samples/server/petstore/kotlin-server/jaxrs-spec-mutiny)	1m 0s
Build Kotlin server (samples/server/petstore/kotlin-server-modelMutable)	1m 27s
Build Kotlin server (samples/server/petstore/kotlin-server/javalin)	1m 17s
Build Kotlin server (samples/server/others/kotlin-server/jaxrs-spec)	53s
Build Kotlin server (samples/server/others/kotlin-server/jaxrs-spec-array-response)	53s
Build Kotlin server (samples/server/petstore/kotlin-spring-cloud)	1m 25s
	20m 58s

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