Incorporating the LMR-R mixture rule into Cantera for the first time

[pjsingal]

Changes proposed in this pull request

• LmrRate.cpp and LmrRate.h allow for vastly improved consideration of the X-dépendent aspect of the rate constants for complex-forming ("pressure-dependent) reactions, using the new LMR-R mixture theory developed by the Burke Lab at Columbia University

• Unlike the version stored at pjsingal/cantera:burkelab_PCI2024_oldCode, which builds, runs, and produces highly verifiable (and peer-reviewed) results, this "new" version of the code builds but does not yet run

• This "new" version has been almost completely redeveloped, with an aim to improve computational speed and outsource as many basic functionalities to other parts of Cantera wherever possible

• This submitted version is very much a work-in-progress. I am requesting feedback on the code structure, assistance in finding bugs, and advice for how to further improve its syntax

Checklist

[x] The pull request includes a clear description of this code change [x] Commit messages have short titles and reference relevant issues [x] Build passes (scons build & scons test) and unit tests address code coverage [] Style & formatting of contributed code follows contributing guidelines [x] The pull request is ready for review

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0.87719% with 226 lines in your changes missing coverage. Please review.

Project coverage is 75.42%. Comparing base (4565a55) to head (0fc2537). Report is 76 commits behind head on main.

:exclamation: Current head 0fc2537 differs from pull request most recent head a2131a2

Please upload reports for the commit a2131a2 to get more accurate results.

Files	Patch %	Lines
src/kinetics/LmrRate.cpp	0.00%	198 Missing :warning:
include/cantera/kinetics/LmrRate.h	0.00%	15 Missing :warning:
interfaces/cython/cantera/reaction.pyx	14.28%	12 Missing :warning:
src/kinetics/ReactionRateFactory.cpp	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1710 +/- ## ========================================== - Coverage 75.72% 75.42% -0.31% ========================================== Files 443 445 +2 Lines 60981 61197 +216 Branches 9557 9584 +27 ========================================== - Hits 46178 46157 -21 - Misses 11777 12003 +226 - Partials 3026 3037 +11 ```

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