Java: Add fromFloat() and toFloat()

[agdavydov81]

In Java (double)3.15f == 3.1500000953674316, so the only way to convert value correctly - use string conversion.
But the string conversion could be slow and also allocate memory.

[pragyan140799]

Hi @agdavydov81 , I'm looking to contribute in open source projects. If you need I can look into this issue and fix.
Thank you

[pragyan140799]

@agdavydov81 can you please reply?

[agdavydov81]

Hi, @pragyan140799
Of course, you could try to fix this issue.
Just create a pull request on you finish.