Update docs about installing Julia

[rdprins]

Context: Julia dependencies (added in order to stabilize the recurrence relation: #274)

Description of the Change: Added Manifest.toml and Project.toml which specify the julia version and dependencies. Updated the README and development guide to instruct the user to install julia and to instantiate the toml files. This means PyJulia now runs in the environment defined by the toml files, rather than in Julia's base environment.

• When installing via devcontainer, julia (v1.9.3) is installed and the environment is instantiaded.
• When installing via MakeFile, the environment is only instantiaded when Julia was previously installed by the user.
• When installing via poetry install or pip install, the julia installation and environment instantiation need to be performed by the user.

Benefits:

Possible Drawbacks:

Related GitHub Issues:

[codecov]

Codecov Report

Merging #290 (91bf6b6) into develop (b5975f6) will increase coverage by 0.28%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #290      +/-   ##
===========================================
+ Coverage    80.03%   80.32%   +0.28%     
===========================================
  Files           57       57              
  Lines         4858     4858              
===========================================
+ Hits          3888     3902      +14     
+ Misses         970      956      -14     

Files	Coverage Δ
mrmustard/utils/settings.py	98.27% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[ziofil]

great!