Switch to glasflow

[mj-will]

This MR changes the library used for normalising flows form nflows to glasflow

Motivation
nflows is not actively maintained and the current release is from two years ago. Furthermore, nflows is not available in conda, a requirement for inclusion in igwn.

glasflow is maintained by myself and others in the IGR so it gives us more control over the library. It includes a fork of nflows (https://github.com/igr-ml/nflows) and the option to fallback to standard nflows if desired.

Changes
Since glasflow includes the fork of nflows as glasflow.nflows the main change is to the imports. There are other minor changes to the documentation and doc-strings.

To-Do

• Wait for release of glasflow on PyPi
• Update changelog

[mj-will]

Tests will fail until glasflow is released

[codecov-commenter]

Codecov Report

Base: 98.71% // Head: 98.71% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (7f70025) compared to base (f967596).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #228   +/-   ##
=======================================
  Coverage   98.71%   98.71%           
=======================================
  Files          48       48           
  Lines        3647     3648    +1     
=======================================
+ Hits         3600     3601    +1     
  Misses         47       47           

Flag	Coverage Δ
unittests	98.71% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nessai/flowmodel/base.py	96.39% <ø> (ø)
nessai/flows/base.py	100.00% <100.00%> (ø)
nessai/flows/distributions.py	100.00% <100.00%> (ø)
nessai/flows/maf.py	100.00% <100.00%> (ø)
nessai/flows/nsf.py	100.00% <100.00%> (ø)
nessai/flows/realnvp.py	100.00% <100.00%> (ø)
nessai/flows/transforms.py	100.00% <100.00%> (ø)
nessai/flows/utils.py	98.42% <100.00%> (+0.03%)	⬆️
nessai/samplers/base.py	100.00% <100.00%> (ø)
nessai/utils/distributions.py	100.00% <100.00%> (ø)

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