[repo] Add version catalog for gradle-build-conventions included build

gradle/versions.properties

@@ -9,6 +9,7 @@ versions.aalto-xml=1.3.0
 versions.gradle-api=4.5.1
 versions.groovy-xml=2.5.11
 versions.groovy=2.5.11
+# should be in sync with libs.versions.toml
 versions.gson=2.8.9
 versions.guava=29.0-jre
 versions.intellij-deps-fastutil=8.5.4-9
@@ -21,6 +22,7 @@ versions.lz4-java=1.7.1
 versions.org.junit.platform=1.7.0
 versions.oro=2.0.8
 versions.serviceMessages=2019.1.4
+# Should be in sync with libs.versions.toml
 versions.shadow=7.1.2
 versions.stax2-api=4.2.1
 versions.streamex=0.7.2
@@ -48,6 +50,7 @@ versions.kotlinx-coroutines-core=1.5.0
 versions.kotlinx-metadata-jvm=0.6.2
 versions.kotlinx-metadata-klib=0.0.1-dev-10
 versions.kotlinx-serialization-json=1.3.3
+# Ktor's versions should be in sync with libs.versions.toml
 versions.ktor-network=2.0.2
 versions.ktor-utils=2.0.2
 versions.ktor-server-test-host=2.0.2