Merge branch 'f-grpc-main' into 'dev'

.gitlab-ci.yml

.gitmodules

CHANGELOG.md

Makefile

caosdb-proto

conf/core/server.conf

pom.xml

src/doc/conf.py

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

src/main/java/org/caosdb/server/FileSystem.java

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

.../database/backend/transaction/DeleteEntityProperties.java

...rver/database/backend/transaction/DeleteSparseEntity.java

...er/database/backend/transaction/InsertEntityDatatype.java

...rver/database/backend/transaction/InsertSparseEntity.java

src/main/java/org/caosdb/server/datatype/BooleanValue.java

src/main/java/org/caosdb/server/datatype/CaosEnum.java

src/main/java/org/caosdb/server/datatype/GenericValue.java

...main/java/org/caosdb/server/datatype/IntegerDatatype.java

...in/java/org/caosdb/server/datatype/ReferenceDatatype.java