for JSON, decimal value's precision is machine dependent, a 0.1 passed in could be resulted to 0.100000005
which will fail the scale check done inside BigDecimalByteStringEncoder.encodeToNumericByteString
we should round the number to 9 digit precision to prevent customer's need to convert to string value for decimal value

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

Fixes #<issue_number_goes_here> ☕️

If you write sample code, please follow the samples format.