Lazy loading

[esoteric-ephemera]

Enhancements:

Expanding scope of lazy loading to:

• Lazily load a rester for an endpoint only when it is inspected
• Lazily initialize a rester only when it is called

Some usage examples for the LazyImport class in tests/core/test_utils.py for how it can be used beyond just the resters

Housekeeping:

Focusing on removing (i) boilerplate repeated code and (ii) extraneous dependencies

• Remove unused dependencies: msgpack
• Remove smart_open in favor of basic boto / gzip interactions
• Remove unused test data which has been ported to emmet
• Make convenience methods for validating formatting of endpoints
• Homogenize _query_open_data to throw uniform errors when objects cannot be found

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.67550% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.20%. Comparing base (30adeba) to head (767f4ea).

Files with missing lines	Patch %	Lines
mp_api/client/core/client.py	95.83%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1044      +/-   ##
==========================================
- Coverage   76.19%   73.20%   -2.99%     
==========================================
  Files          51       51              
  Lines        2798     2665     -133     
==========================================
- Hits         2132     1951     -181     
- Misses        666      714      +48     

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[esoteric-ephemera]

Just to note that these changes are effective: the tests run in roughly 140-160 sec, brought down from 200-210 sec on main