feat: add new json format (#281)

* feat: add new json format

* refactor: rename native format

* chore: store nested data type in json_native_extension

* feat: use json as a concrete type in proto

* Revert "feat: add `BuildIndexRequest` to `RegionRequestHeader` (#276)"

This reverts commit ee46a0eeaa.

proto/greptime/v1/common.proto

@@ -198,10 +198,13 @@ message ColumnDataTypeExtension {
   oneof type_ext {
     DecimalTypeExtension decimal_type = 1;
     // Marks the binary column in proto is actually a JSON column.
+    // Deprecated
     JsonTypeExtension json_type = 2;
     VectorTypeExtension vector_type = 3;
     ListTypeExtension list_type = 4;
     StructTypeExtension struct_type = 5;
+    // Marks the data type is a logical json data
+    JsonNativeTypeExtension json_native_type = 6;
   }
 }
 
@@ -210,6 +213,7 @@ message DecimalTypeExtension {
   int32 scale = 2;
 }
 
+// Deprecated
 enum JsonTypeExtension {
   JSON_BINARY = 0;
 }
@@ -227,6 +231,11 @@ message StructTypeExtension {
   repeated StructField fields = 1;
 }
 
+message JsonNativeTypeExtension {
+  ColumnDataType datatype = 1;
+  ColumnDataTypeExtension datatype_extension = 2;
+}
+
 // Additional options for the column.
 message ColumnOptions {
   // Supported keys: