test: add positive tests for permissive Insert validation behaviour

Three new tests assert that previously-blocked inputs now pass SDK
validation (SDK defers to BE per API spec additionalProperties: Any type):
- Empty values array [] passes
- Null field value passes
- Empty string field value passes

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: Devesh-Skyflow

src/test/java/com/skyflow/vault/data/InsertTests.java

@@ -171,6 +171,43 @@ public void testNoValuesInInsertRequestValidations() {
         }
     }
 
+    @Test
+    public void testEmptyValuesArrayPassesInsertRequestValidations() {
+        // SDK no longer blocks empty values array — BE is authoritative
+        InsertRequest request = InsertRequest.builder().table(table).values(values).build();
+        try {
+            Validations.validateInsertRequest(request);
+        } catch (SkyflowException e) {
+            Assert.fail("Empty values array should pass SDK validation: " + e.getMessage());
+        }
+    }
+
+    @Test
+    public void testNullFieldValuePassesInsertRequestValidations() {
+        // SDK no longer blocks null field values — BE is authoritative per API spec
+        valueMap.put("test_column_1", null);
+        values.add(valueMap);
+        InsertRequest request = InsertRequest.builder().table(table).values(values).build();
+        try {
+            Validations.validateInsertRequest(request);
+        } catch (SkyflowException e) {
+            Assert.fail("Null field value should pass SDK validation: " + e.getMessage());
+        }
+    }
+
+    @Test
+    public void testEmptyStringFieldValuePassesInsertRequestValidations() {
+        // SDK no longer blocks empty string field values — BE is authoritative per API spec
+        valueMap.put("test_column_1", "");
+        values.add(valueMap);
+        InsertRequest request = InsertRequest.builder().table(table).values(values).build();
+        try {
+            Validations.validateInsertRequest(request);
+        } catch (SkyflowException e) {
+            Assert.fail("Empty string field value should pass SDK validation: " + e.getMessage());
+        }
+    }
+
     @Test
     public void testEmptyKeyInValuesInInsertRequestValidations() {
         valueMap.put("", "test_value_3");