feat(java): bundle per-section dialect fixtures in the extensions artifact (#49)

Author: nielspardon

java/extensions/build.gradle.kts

@@ -4,11 +4,13 @@ plugins {
 
 dependencies {}
 
-// No code generation: bundle the Substrait extension YAMLs, text schemas and function
-// test-case files from the attached spec subtree as classpath resources under `substrait/`.
+// No code generation: bundle the Substrait extension YAMLs, text schemas, function
+// test-case files and per-section dialect fixtures from the attached spec subtree as
+// classpath resources under `substrait/`.
 tasks.named<ProcessResources>("processResources") {
   val specDir = "${rootProject.projectDir}/../substrait"
   from("$specDir/extensions") { into("substrait/extensions") }
   from("$specDir/text") { into("substrait/text") }
   from("$specDir/tests/cases") { into("substrait/tests/cases") }
+  from("$specDir/dialects/tests") { into("substrait/dialects/tests") }
 }