Restructure the Materials Project [WIP]

[espottesmith]

Title is a little lofty, but that's basically what we're doing here. This PR (mainly) moves things around and renames them to follow a new structure for the MP API:

• Create three base endpoints/prefixes: /materials, /molecules, and /legacy.
• Move all existing materials-based endpoints under /materials
• Put all of the MPcules data/web apps under /molecules
• Move the current /molecules (from JCESR/ the Electrolyte Genome Project) to /legacy/jcesr

This is listed as WIP for two reasons:

1. I should probably get approval for such sweeping structural change, and I want to give others a chance to make tweaks.
2. I should probably go back through emmet-core and emmet-builders and remove references to "MPcules", since it appears we won't be using that name for the API/Web site (or at least, not much).

Only API has been touched, and all API tests pass locally.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -2.78 ⚠️

Comparison is base (9778756) 90.65% compared to head (ec24c8c) 87.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #698      +/-   ##
==========================================
- Coverage   90.65%   87.87%   -2.78%     
==========================================
  Files         148      120      -28     
  Lines       11450     7210    -4240     
==========================================
- Hits        10380     6336    -4044     
+ Misses       1070      874     -196     

Impacted Files	Coverage Δ
...i/emmet/api/routes/legacy/jcesr/query_operators.py	88.63% <ø> (ø)
...mmet/api/routes/materials/bonds/query_operators.py	100.00% <ø> (ø)
...routes/materials/charge_density/query_operators.py	100.00% <ø> (ø)
...et/api/routes/materials/chemenv/query_operators.py	100.00% <ø> (ø)
...api/routes/materials/dielectric/query_operators.py	100.00% <ø> (ø)
...api/routes/materials/elasticity/query_operators.py	100.00% <ø> (ø)
...api/emmet/api/routes/materials/electrodes/utils.py	93.54% <ø> (ø)
.../materials/electronic_structure/query_operators.py	93.24% <ø> (ø)
...routes/materials/grain_boundary/query_operators.py	100.00% <ø> (ø)
.../api/routes/materials/magnetism/query_operators.py	100.00% <ø> (ø)
... and 32 more

... and 41 files with indirect coverage changes

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[espottesmith]

Alright, I've gone through and changed some names in emmet-core and emmet-builders. I was too lazy to create a new directory structure to group all of the materials stuff (though it should be done at some point).

[munrojm]

@espottesmith thanks again for all this restructuring. Everything looks good to me. Are you happy to have it merged now?

[espottesmith]

Yep, happy to have it merged if you are.