Remove poetry lock, use newer build system

[adamgayoso]

• Update poetry build system
• Remove lock file, as it's not useful given the many number of ways pytorch/jax can be installed

The first change still allows pip install -e . and this is the recommended way to install (in a virtualenv)

See python-poetry/poetry#34 for more discussion (specifically the end)

[codecov]

Codecov Report

Merging #1645 (d2a67c9) into master (4f00985) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1645   +/-   ##
=======================================
  Coverage   91.26%   91.26%           
=======================================
  Files         116      116           
  Lines        9193     9193           
=======================================
  Hits         8390     8390           
  Misses        803      803           

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[watiss]

Do we need to update scvi documentation https://docs.scvi-tools.org/en/stable/contributing/index.html ?

[adamgayoso]

Do we need to update scvi documentation https://docs.scvi-tools.org/en/stable/contributing/index.html ?

Nope, all these things still work, maybe the poetry install is not recommended, but I think this is fine.