[WIP] Add liquid state optimizations via sample_state attribute of ConfigSimulator

[mgiammar]

Addresses #211

• Update changelog
• Include sample_state in relevant documentation examples
• Cover new code with pytest

[codecov]

Codecov Report

Attention: Patch coverage is 52.94118% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 99.89%. Comparing base (545e4dd) to head (e9705b8).
Report is 18 commits behind head on master.

❗ Current head e9705b8 differs from pull request most recent head 81c5b0b. Consider uploading reports for the commit 81c5b0b to get more accurate results

Files	Patch %	Lines
src/mrsimulator/simulator/__init__.py	33.33%	6 Missing ⚠️
src/mrsimulator/simulator/config.py	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #267      +/-   ##
==========================================
+ Coverage   99.32%   99.89%   +0.56%     
==========================================
  Files         120      112       -8     
  Lines        8330     7297    -1033     
==========================================
- Hits         8274     7289     -985     
+ Misses         56        8      -48     

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