[PR] [variant][spark] Add support for read and write shredding [paimon]

[via GitHub]

Zouxxyy opened a new pull request, #5905:
URL: https://github.com/apache/paimon/pull/5905

   <!-- Please specify the module before the PR name: [core] ... or [flink] ... 
-->
   
   ### Purpose
   
   usage:
   
   ```sql
   CREATE TABLE T (id INT, v VARIANT)
   TBLPROPERTIES (
   'fields.v.shredding-schema' = 
'{"type":"ROW","fields":[{"name":"age","type":"INT"}, 
{"name":"city","type":"STRING"}]}'
   )
   
   INSERT INTO T VALUES parse_json('{"age":27,"city":"Beijing"};
   
   SELECT variant_get(v, '$.age', 'int') FROM T ORDER BY id;
   ```
   
   ### Tests
   
   <!-- List UT and IT cases to verify this change -->
   
   ### API and Format
   
   <!-- Does this change affect API or storage format -->
   
   ### Documentation
   
   <!-- Does this change introduce a new feature -->
   


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