API modules do not need to setup dependency injection.

Move the implementation to the impl modules.

libraries/matrix/api/build.gradle.kts

@@ -1,6 +1,5 @@
 import config.BuildTimeConfig
 import extension.buildConfigFieldStr
-import extension.setupDependencyInjection
 import extension.testCommonDependencies
 
 /*
@@ -17,8 +16,6 @@ plugins {
     alias(libs.plugins.kotlin.serialization)
 }
 
-setupDependencyInjection()
-
 android {
     namespace = "io.element.android.libraries.matrix.api"