feat(query): support json_object_delete and json_object_pick function

[b41sh]

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Summary

• support json_object_delete function
• support json_object_pick function
• allow cast variant to map<string, variant>

for example

MySQL [(none)]> SELECT json_object_delete('{"a":1,"b":2,"d":4}'::variant, 'a', 'c');
+--------------------------------------------------------------+
| json_object_delete('{"a":1,"b":2,"d":4}'::VARIANT, 'a', 'c') |
+--------------------------------------------------------------+
| {"b":2,"d":4}                                                |
+--------------------------------------------------------------+
1 row in set (0.167 sec)

MySQL [(none)]> SELECT json_object_pick('{"a":1,"b":2,"d":4}'::variant, 'a', 'c');
+------------------------------------------------------------+
| json_object_pick('{"a":1,"b":2,"d":4}'::VARIANT, 'a', 'c') |
+------------------------------------------------------------+
| {"a":1}                                                    |
+------------------------------------------------------------+
1 row in set (0.046 sec)

MySQL [(none)]> select '{"k1":"v1","k2":"v2"}'::Variant a, a::Map(String, String) b, b::Variant = a;
+-----------------------+-----------------------+----------------+
| a                     | b                     | b::VARIANT = a |
+-----------------------+-----------------------+----------------+
| {"k1":"v1","k2":"v2"} | {'k1':'v1','k2':'v2'} |              1 |
+-----------------------+-----------------------+----------------+
1 row in set (0.051 sec)

fixes: #[Link the issue here]

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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This change is