Investigate if Jackson 2.15 provided "fast floating-point" improves BigDecimal writes, enable

[tatu-at-datastax]

As per Blog post:

https://medium.com/@cowtowncoder/jackson-2-15-faster-floating-point-writes-too-19958e310185

Jackson 2.15 already has opt-in feature that improves writing of floating-point values (float, double).
Since Vector use case has to write large arrays of FP values this seems like a potential for improvements.
The only (?) question is whether writing of BigDecimal is improved as well; this is not guaranteed given different underlying number representation.

Testing can be done by modifying one of benchmarks of https://github.com/FasterXML/jackson-benchmarks.

If this shows potential improvement, should also enable this setting for JSON API.

[tatu-at-datastax]

Turns out that writing (serialization) of BigDecimal only uses JDK and there is no optimized solution there (unlike with reads, see #653).
Will close this issue.