Poetry setup for PyElastica (#101)

[bhosale2]

Fixes #101, a brief checklist:

• Add pyproject.toml/lock and modify main.yml
• Update publish-to-pypi.yml
• update docs CI
• update contrib guidelines to reflect poetry changes
• update docs readme to reflect poetry changes
• Remove setup.py, requirements.txt after confirming complete transfer of information

[codecov-commenter]

Codecov Report

Merging #141 (00ce48c) into update-0.3.0 (735fe00) will increase coverage by 0.34%.
The diff coverage is n/a.

❗ Current head 00ce48c differs from pull request most recent head 216784e. Consider uploading reports for the commit 216784e to get more accurate results

@@               Coverage Diff                @@
##           update-0.3.0     #141      +/-   ##
================================================
+ Coverage         87.30%   87.65%   +0.34%     
================================================
  Files                44       43       -1     
  Lines              2695     2770      +75     
  Branches            360      359       -1     
================================================
+ Hits               2353     2428      +75     
  Misses              324      324              
  Partials             18       18              

Impacted Files	Coverage Δ
elastica/boundary_conditions.py	96.42% <ø> (+0.05%)	⬆️
elastica/joint.py	24.91% <ø> (+2.80%)	⬆️
elastica/rod/cosserat_rod.py	100.00% <ø> (ø)
elastica/timestepper/__init__.py	100.00% <ø> (ø)
elastica/rod/knot_theory.py	97.54% <0.00%> (-0.44%)	⬇️
elastica/_rotations.py	100.00% <0.00%> (ø)
elastica/_elastica_numba.py
elastica/timestepper/symplectic_steppers.py	97.97% <0.00%> (+0.02%)	⬆️
elastica/utils.py	98.03% <0.00%> (+0.03%)	⬆️
... and 9 more

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[skim0119]

LGTM. Some question on supported python version. If we want to include 3.9 and 3.10, we should include the CI for windows together with this PR. Or, we can be vague and just say python 3.8+

[skim0119]

@bhosale2 Since you are the only one working on this branch, can you rebase and squash those attempts commits?

[skim0119]

I'll finish the review and merge after I try to add 3.6 (trying to find a way to ignore python-version for extra dependencies).

[armantekinalp]

LGTM

[skim0119]

Okay, looks like mypy is not the only conflicting dependency. I see coverage and pytest also shifted their python requirement to be 3.7+, and I guess there are more.

[skim0119]

LGTM