Added optional params sub_bit_prec and epsilon to preprocess_lcu_coefficients_for_reversible_sampling

[Vicara12]

This PR solves issue #799. Now preprocess_lcu_coefficients_for_reversible_sampling accepts either a tolerance epsilon or a number of bits of precision sub_bit_prec, related as $\epsilon = 2^{-n_b}$.

[Vicara12]

@tanujkhattar it seems that there is a problem with Pylint, if I run it locally it always gives errors for the same files (which have not been modified):

************* Module qualtran.surface_code.ui_test
qualtran/surface_code/ui_test.py:16:0: E0401: Unable to import 'dash.exceptions' (import-error)
************* Module qualtran.surface_code.ui
qualtran/surface_code/ui.py:19:0: E0401: Unable to import 'plotly.express' (import-error)
qualtran/surface_code/ui.py:20:0: E0401: Unable to import 'plotly.graph_objects' (import-error)
qualtran/surface_code/ui.py:21:0: E0401: Unable to import 'dash' (import-error)
qualtran/surface_code/ui.py:22:0: E0401: Unable to import 'dash.exceptions' (import-error)

Is this normal or I'm doing something wrong?

[fdmalone]

Are you running ./check/pylint?

[fdmalone]

You might need to reinstall the requirements,

pip install -r dev_tools/requirements/envs/dev.env.txt

[fdmalone]

Thanks! Just spell out the kwargs though.

[tanujkhattar]

@Vicara12 Can you please address the comments?

[tanujkhattar]

I've addressed the comments and made some more minor improvements which will be useful in a followup PR I'm working on. We can merge this.

I've addressed all the comments so we can merge now.