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ARROW-5461: [Java] Add micro-benchmarks for Float8Vector and allocators

For the past days, we have been involved in some performance related issues. In this process, we have created some performance benchmarks, to help us verify performance results.

Now we want to add such micro-benchmarks to the code base, in the hope that they will be helpful for making performance-related decisions and avoid performance degradation.

Author: liyafan82 <fan_li_ya@foxmail.com>

Closes #4430 from liyafan82/fly_0531_benchmark and squashes the following commits:

fde0e0a21 <liyafan82>  Move benchmarks to tests
e734b404f <liyafan82>  Add micro-benchmarks for Float8Vector and allocators