Add more detailed message to AvroConversionException in case of AvroTypeException

Author: jewertow

converter/src/main/java/tech/allegro/schema/json2avro/converter/JsonGenericRecordReader.java

@@ -56,6 +56,8 @@ public GenericData.Record read(Map<String, Object> json, Schema schema) {
         Deque<String> path = new ArrayDeque<>();
         try {
             return readRecord(json, schema, path);
+        } catch (AvroTypeException ex) {
+            throw new AvroConversionException("Failed to convert JSON to Avro: " + ex.getMessage(), ex);
         } catch (AvroRuntimeException ex) {
             throw new AvroConversionException("Failed to convert JSON to Avro", ex);
         }

converter/src/test/groovy/tech/allegro/schema/json2avro/converter/JsonAvroConverterSpec.groovy

@@ -122,7 +122,8 @@ class JsonAvroConverterSpec extends Specification {
         converter.convertToAvro(json.bytes, schema)
 
         then:
-        thrown AvroConversionException
+        def e = thrown AvroConversionException
+        e.message == "Failed to convert JSON to Avro: Field field_integer is expected to be type: java.lang.Number"
     }
 
     def "should ignore unknown fields"() {