Adding a beam flink plugin for shared runner versions

theodolite-benchmarks/buildSrc/src/main/groovy/theodolite.beam.flink.gradle

+plugins {
+    id 'theodolite.beam'
+}
+
+dependencies {
+    compile group: 'org.apache.beam', name: 'beam-runners-flink-1.12', version: '2.27.0'
+}
\ No newline at end of file

theodolite-benchmarks/uc1-beam-flink/build.gradle

 plugins {
-  id 'theodolite.beam'
+  id 'theodolite.beam.flink'
 }
 
 dependencies {
-      compile group: 'org.apache.beam', name: 'beam-runners-flink-1.12', version: '2.27.0'
       compile project(':uc1-beam')
 }
 

theodolite-benchmarks/uc2-beam-flink/build.gradle

 plugins {
-  id 'theodolite.beam'
+  id 'theodolite.beam.flink'
 }
 
 
 dependencies {
-  compile group: 'org.apache.beam', name: 'beam-runners-flink-1.12', version: '2.27.0'
   compile project(':uc2-beam')
 }
 

theodolite-benchmarks/uc3-beam-flink/build.gradle

 plugins {
-  id 'theodolite.beam'
+  id 'theodolite.beam.flink'
 }
 
 
 dependencies {
-  compile group: 'org.apache.beam', name: 'beam-runners-flink-1.12', version: '2.27.0'
   compile project(':uc3-beam')
 }
 

theodolite-benchmarks/uc4-beam-flink/build.gradle

 plugins {
-  id 'theodolite.beam'
+  id 'theodolite.beam.flink'
 }
 
 
 dependencies {
-  compile group: 'org.apache.beam', name: 'beam-runners-flink-1.12', version: '2.27.0'
   compile project(':uc4-beam')
 }