[PR] Core: add variant builder implementation [iceberg]

[via GitHub]

aihuaxu opened a new pull request, #11857:
URL: https://github.com/apache/iceberg/pull/11857

   This PR adds the implementation to build a variant for primitive, object and 
array.
   
   The usage:
   
   - Build from Json
   `VariantBuilder.parseJson(json_string);`
   
   - build a primitive
   ```
   VariantBuilder builder = new VariantBuilder();
   VariantPrimitiveBuilder primBuilder = builder.createPrimitive();
   Variant variant = primBuilder.writeNumeric(10).build();
   
   ```
   - build an object
   ```
    VariantBuilder builder = new VariantBuilder();
    VariantObjectBuilder objBuilder = builder.startObject();
    objBuilder.writeString("key1", "value1").writeNumeric("key2", 
3).endObject();
    Variant variant = builder.build();
   ```
   
   - build an array
   ```
    VariantBuilder builder = new VariantBuilder();
    VariantArrayBuilder arrBuilder = builder.createArray();
    arrBuilder.writerNumeric(10).writerNumeric(20).endArray();
    Variant variant = builder.build();
   ```
   
   Part of: #10392 


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