Fix instrumentation core artifact names (#885)

instrumentation-core/servlet/servlet.gradle

@@ -2,6 +2,7 @@ ext {
   javaSubPackage = 'servlet'
 }
 apply from: "$rootDir/gradle/instrumentation-library.gradle"
+archivesBaseName = "servlet"
 
 dependencies {
   implementation deps.slf4j

instrumentation-core/spring/spring-web-3.1/spring-web-3.1.gradle

@@ -3,7 +3,8 @@ ext{
 }
 
 apply from: "$rootDir/gradle/instrumentation-library.gradle"
+archivesBaseName = "spring-web-3.1"
 
 dependencies {
   compileOnly "org.springframework:spring-web:3.1.0.RELEASE"
-}
+}

instrumentation-core/spring/spring-webflux-5.0/spring-webflux-5.0.gradle

@@ -4,8 +4,9 @@ ext {
 }
 
 apply from: "$rootDir/gradle/instrumentation-library.gradle"
+archivesBaseName = "spring-webflux-5.0"
 
 dependencies {
   compileOnly group: 'org.springframework', name: 'spring-webflux', version: '5.0.0.RELEASE'
   compileOnly group: 'io.projectreactor.ipc', name: 'reactor-netty', version: '0.7.0.RELEASE'
-}
+}

instrumentation-core/spring/spring-webmvc-3.1/spring-webmvc-3.1.gradle

@@ -3,9 +3,10 @@ ext{
 }
 
 apply from: "$rootDir/gradle/instrumentation-library.gradle"
+archivesBaseName = "spring-webmvc-3.1"
 
 dependencies {
-  api project(':instrumentation-core:servlet')
+  implementation project(':instrumentation-core:servlet')
   
   compileOnly group: 'org.springframework', name: 'spring-webmvc', version: '3.1.0.RELEASE'
   compileOnly group: 'javax.servlet', name: 'javax.servlet-api', version: '3.1.0'