Kotlin coroutines should be declared as an API dependency

As the API exports Flow types via delegation

JAVA-5022

Author: rozza

driver-kotlin-coroutine/build.gradle.kts

@@ -60,7 +60,7 @@ dependencies {
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
 
     implementation(platform("org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.6.4"))
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core")
+    api("org.jetbrains.kotlinx:kotlinx-coroutines-core")
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactive")
 
     api(project(path = ":bson", configuration = "default"))