feat: Add JSON type support to Node.js API

[tobiasstrebitzer]

This PR adds support for the JSON logical type in the Node.js API, allowing JSON values from the database to be properly converted to JavaScript objects.

Changes Made

1. Fixed JSON Type Conversion (src_cpp/node_util.cpp)

• Added proper JSON parsing using JSON.parse() for JSON values stored as strings

2. Added JSON Test Case (test/test_data_type.js)

• Added comprehensive test that verifies JSON object and array conversion

Testing

• All existing tests continue to pass
• New JSON test passes, verifying proper object/array conversion

Impact

• Fixes 'Unsupported type: JSON' error when querying JSON columns from Node.js
• Enables full JSON functionality in the Node.js API

[aheev]

LGTM overall. Let's see if the tests pass. Can you please fix your tree though?

[aheev]

We might need similar fix in wasm too

[tobiasstrebitzer]

LGTM overall. Let's see if the tests pass. Can you please fix your tree though?

fixed 👍

We might need similar fix in wasm too

I'll take a look at that