Expose n_bins argument from align_embeddings

[stes]

Fix #24

Thanks to @drsax93 for flagging and testing!

I also added the required functions to the docs.

Before	After

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[github-actions]

Docstring Coverage Report

Name	Total	Miss	Cover	Cover%
main.py	5	1	4	80%
config.py	6	4	2	33%
data/datatypes.py	5	2	3	60%
data/helper.py	6	1	5	83%
data/multi_session.py	12	5	7	58%
datasets/demo.py	8	3	5	62%
datasets/gaussian_mixture.py	3	2	1	33%
datasets/hippocampus.py	7	1	6	86%
datasets/save_dataset.py	4	1	3	75%
datasets/allen/single_session_ca.py	9	3	6	67%
distributions/discrete.py	9	2	7	78%
distributions/multisession.py	5	1	4	80%
integrations/sklearn/helpers.py	2	1	1	50%
integrations/sklearn/metrics.py	3	1	2	67%
integrations/sklearn/utils.py	6	1	5	83%
models/projector.py	12	9	3	25%
------------------------------------------	--------	-------	--------	---------
TOTAL	396	38	358	90.4%
(45 of 61 files omitted due to complete coverage)

RESULT: PASSED (minimum: 90.0%, actual: 90.4%)

[drsax93]

This works, decrease the n_bins does the trick!

[stes]

Thanks for confirming, @drsax93 --- we will work on shipping this feature in an upcoming version of CEBRA then.