Reorganize reaction rate classes

[speth]

Changes proposed in this pull request

• Move each implementation of a ReactionRate (e.g. TwoTempPlasmaRate) to a header file of its own, along with the implementation of the corresponding ReactionData class. By making rate implementations self-contained, I think this makes it easier for users to see how to add new ones of their own.
• Move the ReactionFactory declaration into an internal header file, so it can be removed after 2.6 without having to go through a deprecation cycle. (this class was introduced after Cantera 2.5, and so has never been a part of the released API)
• Deprecate the update_C and updateRC methods of ChebyshevRate and PlogRate, which are used directly only by the "legacy" rate methods.

Checklist

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

[ischoegl]

@speth ... I have absolutely no problem with this proposition (it makes sense). Would it make sense to also introduce BulkRate.h as envisioned in #1219? It is the direct correspondence to InterfaceRate ....

PS: also marked this as relevant for the beta release ...

PPS: For #1219 this is just 96d42a0 and bcf6ca7 (and potentially ab47b50)

[codecov]

Codecov Report

Merging #1223 (ac14f3d) into main (4bfd2a8) will decrease coverage by 0.00%.
The diff coverage is 90.47%.

@@            Coverage Diff             @@
##             main    #1223      +/-   ##
==========================================
- Coverage   65.44%   65.44%   -0.01%     
==========================================
  Files         320      327       +7     
  Lines       46321    46321              
  Branches    19688    19688              
==========================================
- Hits        30315    30314       -1     
  Misses      13475    13475              
- Partials     2531     2532       +1     

Impacted Files	Coverage Δ
include/cantera/kinetics/Arrhenius.h	70.90% <ø> (-11.57%)	⬇️
include/cantera/kinetics/Custom.h	85.71% <ø> (ø)
include/cantera/kinetics/Kinetics.h	36.52% <ø> (ø)
include/cantera/kinetics/Reaction.h	100.00% <ø> (ø)
include/cantera/kinetics/RxnRates.h	90.90% <ø> (-2.43%)	⬇️
src/kinetics/ReactionFactory.cpp	93.65% <ø> (+4.76%)	⬆️
src/kinetics/ReactionFactory.h	90.00% <ø> (ø)
src/kinetics/ReactionRateFactory.cpp	94.82% <ø> (ø)
src/kinetics/RxnRates.cpp	78.26% <ø> (-14.47%)	⬇️
src/kinetics/importKinetics.cpp	74.60% <ø> (ø)
... and 21 more

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[speth]

I like the changes in bcf6ca7. I actually think they make the BulkRate class almost unnecessary. I'd like to see what I can get out of pursuing that in a separate PR, since this one already has so much cut-and-paste rearrangement that I think it would be harder to see the specific changes related to that refactoring.

[ischoegl]

As far as I am aware, this is just code reorganization …