Pre-merge code cleanup

src/dlt/connector/service/DltConnectorServiceServicerImpl.py

src/dlt/connector/service/__main__.py

src/dlt/gateway/_legacy/.gitignore

src/dlt/gateway/_legacy/Dockerfile

src/dlt/gateway/_legacy/README.md

src/dlt/gateway/_legacy/build.gradle.kts

src/dlt/gateway/_legacy/config/ca.org1.example.com-cert.pem

src/dlt/gateway/_legacy/config/connection-org1.json

src/dlt/gateway/_legacy/gradle.properties

src/dlt/gateway/_legacy/gradle/wrapper/gradle-wrapper.jar

.../gateway/_legacy/gradle/wrapper/gradle-wrapper.properties

src/dlt/gateway/_legacy/gradlew

src/dlt/gateway/_legacy/gradlew.bat

src/dlt/gateway/_legacy/settings.gradle.kts

src/dlt/gateway/_legacy/src/main/kotlin/Main.kt

.../gateway/_legacy/src/main/kotlin/fabric/ConnectGateway.kt

...dlt/gateway/_legacy/src/main/kotlin/fabric/EnrollAdmin.kt

...gateway/_legacy/src/main/kotlin/fabric/FabricConnector.kt

...lt/gateway/_legacy/src/main/kotlin/fabric/RegisterUser.kt

src/dlt/gateway/_legacy/src/main/kotlin/grpc/FabricServer.kt