Develop queuing algorithms and some relevant functionalities for asynchronous REXEE

[weitse-hsu]

Description

In this PR, we aim to add some features that can be used by asynchronous REXEE. Note that this currently only for experimental purposes.

Type of Change

• New feature

Todos

Notable points that this PR has either accomplished or will accomplish.

• Implement a preliminary queuing algorithm.

Checklist

Starting from PR #62, external PRs must keep the following checklist in the PR.

• I have read the contributing guidelines.
• My code follows the project’s coding style and is free from linting errors examined by flake8.
• My code comes with docstrings that follow the NumPy docstrings standard.
• I have updated the documentation in the docs directory if my changes affect the project's functionality or usage.
• I have added new tests for new features or changes to existing features. The code coverage is at least 90%.
• My code passes all unit tests and CI tests on CircleCI.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.47%. Comparing base (9958558) to head (625b677).

Files with missing lines	Patch %	Lines
ensemble_md/replica_exchange_EE.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
- Coverage   95.51%   95.47%   -0.05%     
==========================================
  Files          10       10              
  Lines        1919     1921       +2     
==========================================
+ Hits         1833     1834       +1     
- Misses         86       87       +1     

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