Rate limiting added to core client

[munrojm]

Rate limiting added to core client query and post methods.

[codecov-commenter]

Codecov Report

Merging #315 (cb0ae8c) into main (0bbefea) will increase coverage by 56.69%.
The diff coverage is 79.27%.

@@             Coverage Diff             @@
##             main     #315       +/-   ##
===========================================
+ Coverage   32.39%   89.08%   +56.69%     
===========================================
  Files         109       59       -50     
  Lines        3084     1915     -1169     
===========================================
+ Hits          999     1706      +707     
+ Misses       2085      209     -1876     

Impacted Files	Coverage Δ
src/mp_api/__init__.py	100.00% <ø> (+43.47%)	⬆️
src/mp_api/routes/synthesis/data_adaptor.py	0.00% <0.00%> (ø)
src/mp_api/routes/synthesis/data_adaptor_synpro.py	0.00% <0.00%> (ø)
src/mp_api/routes/tasks/client.py	92.85% <ø> (+28.15%)	⬆️
src/mp_api/routes/dielectric/client.py	91.66% <50.00%> (+46.66%)	⬆️
src/mp_api/routes/molecules/client.py	90.32% <50.00%> (+51.03%)	⬆️
src/mp_api/routes/elasticity/client.py	93.93% <66.66%> (+59.45%)	⬆️
src/mp_api/routes/electrodes/client.py	87.50% <66.66%> (+37.50%)	⬆️
src/mp_api/routes/piezo/client.py	89.47% <66.66%> (+33.91%)	⬆️
src/mp_api/routes/robocrys/client.py	92.30% <66.66%> (+19.58%)	⬆️
... and 101 more

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