Add methods to read raw ACC and GYR data from FIFO

[jerabaul29]

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Summary
Make it possible to get the raw data directly from the FIFO buffers. Similar to the GetAxesRaw methods that were existing for reading ACC and GYR in non FIFO settings, but for the FIFO reading setting.

Validation

Tested on my desk, works fine with an adapted version of the FIFO example that uses the raw readings instead.

Closing issues

closes #15

[jerabaul29]

@cparata this is what we had discussed yesterday :) .

I agree this is a "trivial" change, but since this is available for the "native" ACC and GYR readings already, why not for the FIFO readings also? :)

At least to me it is useful :) .

[jerabaul29]

(this time I got the CICD "right", by looking at how you did it yesterday and bumping the minor version tag :) ).

[jerabaul29]

Thanks for the merge! :)