Add simple safeguarded compressor wrappers for BitRound, ZFP, SZ3, and SPERR

[juntyr]

This PR adds (simple) safeguarded (https://github.com/juntyr/compression-safeguards) variants for the BitRound+PCO, ZFP-ROUND, SZ3, and SPERR compressors

[juntyr]

@treigerm The safeguards have their first public alpha release on PyPi now, so this is ready for our debugging session tomorrow

[juntyr]

@treigerm This is now ready again, please completely remove the .venv before rerunning the benchmark

[juntyr]

Also, please include all safeguarded compressors (safeguarded-bitround-pco, safeguarded-zfp-round, safeguarded-sz3, safeguarded-sperr, safeguarded-zero, safeguarded-zero-dssim). Thanks!

[juntyr]

@treigerm I would like to merge this PR in and just have the safeguards part of the benchmark (which makes follow-up work easier).

Adjustments for plotting will come in #66, but that will require some refactoring after I get the plots as I want.

[juntyr]

While the Safeguarded(0, dSSIM) compressor works as expected on 2D data, it fails once we have different height levels, since analysis quantises over the 2D min-max range, but the safeguards are only given the global ones. This could be done by threading through the per-2D level range ... let's see if I can make it work