Add jacoco plugin to subprojects for Codecov coverage reports

The jacoco plugin was missing from the subprojects block in root build.gradle, causing jacocoTestReport tasks to not exist for python-embed-runtime and python-embed-spring-boot-starter. This resulted in Codecov finding 0 coverage reports. Adding 'apply plugin: jacoco' to subprojects enables XML report generation for all subprojects.

Author: white

build.gradle

@@ -14,6 +14,7 @@ subprojects {
     group = rootProject.group
 
     apply plugin: 'java'
+    apply plugin: 'jacoco'
     apply plugin: 'com.vanniktech.maven.publish'
 
     repositories {