Merge branch 'f-more-sql-benchmarking' into 'dev'

.gitlab-ci.yml

conf/core/server.conf

doc/devel/Benchmarking.md

pom.xml

src/main/java/caosdb/server/CaosDBServer.java

src/main/java/caosdb/server/ServerProperties.java

src/main/java/caosdb/server/caching/JCSCacheHelper.java

src/main/java/caosdb/server/database/BackendTransaction.java

...ckend/implementation/MySQL/MySQLRetrieveSparseEntity.java

...ava/caosdb/server/database/misc/TransactionBenchmark.java

.../caosdb/server/entity/container/TransactionContainer.java

src/main/java/caosdb/server/query/POV.java

src/main/java/caosdb/server/resource/FileSystemResource.java

src/main/java/caosdb/server/resource/InfoResource.java

...va/caosdb/server/resource/transaction/EntityResource.java

src/test/docker/Dockerfile

src/test/java/caosdb/server/caching/TestNoCaching.java