Organize test-cases into folders, extract compatibility test into proper test, support adding test-case specific tests

betterproto/tests/inputs/ref/ref.json

@@ -0,0 +1,5 @@
+{
+  "greeting": {
+    "greeting": "hello"
+  }
+}

betterproto/tests/inputs/ref/ref.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package ref;
+
+import "repeatedmessage.proto";
+
+message Test {
+  repeatedmessage.Sub greeting = 1;
+}

betterproto/tests/inputs/ref/repeatedmessage.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package repeatedmessage;
+
+message Test {
+  repeated Sub greetings = 1;
+}
+
+message Sub {
+  string greeting = 1;
+}