docs: update c native stmt2 example

[qevolg]

Description

Update c native stmt2 example

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @qevolg, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the C native stmt2 example by modifying the data type of the phase column from binary to float, aligning the example with a more common numerical data representation. It also scales up the data generation to demonstrate the insertion of a larger volume of data, providing a more robust and realistic usage scenario for the stmt2 API.

Highlights

• Data Type Update: The phase column in the power.meters stable table definition and its corresponding data binding in the C example have been updated from BINARY to FLOAT.
• Increased Data Volume: The example now generates and inserts more data, specifically increasing NUM_OF_SUB_TABLES and NUM_OF_ROWS from 1 to 10 to provide a more comprehensive demonstration.
• Code Cleanup: An unused variable len was removed from the prepareBindData function, improving code clarity.

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[gemini-code-assist]

Code Review

This pull request updates the C native stmt2 example. The changes include increasing the number of sub-tables and rows for a more substantial demonstration, and changing the phase column from a binary string to a float type, which is more realistic for the 'meters' stable. The code is also cleaned up by removing an unused variable and fixing a potential bug in memory allocation size for parameters. My review includes a suggestion to improve robustness by checking the return value of malloc.