Introduce generic interface for database storage

...enchmarks/buildSrc/src/main/groovy/theodolite.beam.gradle

...nchmarks/buildSrc/src/main/groovy/theodolite.flink.gradle

...marks/buildSrc/src/main/groovy/theodolite.kstreams.gradle

theodolite-benchmarks/settings.gradle

theodolite-benchmarks/uc1-beam/build.gradle

.../uc1-beam/src/main/java/application/ConverterAdapter.java

...marks/uc1-beam/src/main/java/application/LogKeyValue.java

...chmarks/uc1-beam/src/main/java/application/MapToGson.java

...s/uc1-beam/src/main/java/application/Uc1BeamPipeline.java

...rks/uc1-beam/src/main/java/application/WriterAdapter.java

...benchmarks/uc1-commons/.settings/org.eclipse.jdt.ui.prefs

.../uc1-commons/.settings/qa.eclipse.plugin.checkstyle.prefs

...chmarks/uc1-commons/.settings/qa.eclipse.plugin.pmd.prefs

theodolite-benchmarks/uc1-commons/build.gradle

...ks/theodolite/benchmarks/uc1/commons/DatabaseAdapter.java

...cks/theodolite/benchmarks/uc1/commons/DatabaseWriter.java

...ks/theodolite/benchmarks/uc1/commons/RecordConverter.java

...eodolite/benchmarks/uc1/commons/logger/JsonConverter.java

...s/theodolite/benchmarks/uc1/commons/logger/LogWriter.java

...olite/benchmarks/uc1/commons/logger/LogWriterFactory.java