Add oversampling setting adjustment

[jaxxzer]

This will allow us to reduce the blocking measurement delay time.

[jaxxzer]

For example, our python library already supports this: https://github.com/bluerobotics/ms5837-python#readoversamplingosr_8192

[senceryazici]

Absolutely, right now we're having issues using our bar30 sensor, as the sensor spends time of 40ms to read, it reduces our communication rate down to ~50Hz,

since the oversampling can be set to 256, it can be running at 1.5Khz.
Please implement this feature to the arduino library.

Thanks

[senceryazici]

I've modified such changes on my forked repository. => https://github.com/senceryazici/BlueRobotics_MS5837_Library/tree/pr_osr_implementation

I can open a pull request if you like.

Thanks

[jaxxzer]

I can open a pull request if you like.

@senceryazici yes please 👍

[senceryazici]

Pending pull request #16

[kiteborne]

Why does it not compile on teensy 3.2 ? - is it some of the math in the library (POW) forexample ?