Potential fix for code scanning alert no. 405: Incorrect conversion between integer types

[joel-rieke]

Potential fix for https://github.com/trimble-oss/go-mysql-server/security/code-scanning/405

The issue arises because float32 values are converted to int64 without verifying that the values are within the valid range for int64. To fix this:

1. Add a bounds check for the float32 value before converting it to int64. Specifically:
   • Ensure that the value is greater than or equal to math.MinInt64 and less than or equal to math.MaxInt64. These constants define the valid range for int64.
   • An additional check should ensure that the value has no fractional component (similar to the float64 handling on lines 119–121).
2. Modify the case float32 block in the Convert function to include these checks before performing the conversion.

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