Develop queuing algorithms and some relevant functionalities for asynchronous REXEE

[wehs7661]

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

• [ ] Bug fix
• [x] New feature
• [ ] Documentation update
• [ ] Unit test and CI update
• [ ] Other

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[bot]]

Codecov Report

Attention: Patch coverage is 7.85619% with 692 lines in your changes missing coverage. Please review.

Project coverage is 70.75%. Comparing base (9958558) to head (7c73b27).

Files with missing lines	Patch %	Lines
ensemble_md/utils/coordinate_swap.py	6.24%	616 Missing :warning:
ensemble_md/replica_exchange_EE.py	19.14%	76 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #64 +/- ## =========================================== - Coverage 95.51% 70.75% -24.77% =========================================== Files 10 11 +1 Lines 1919 2660 +741 =========================================== + Hits 1833 1882 +49 - Misses 86 778 +692 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.