ReactionMethod etc updates to reduce startup time

[sjdaines]

Small updates to reduce startup time:

• despecialize ReactionMethod
• simplify RateStoich
• implement copy(VariableReaction) instead of using generic deepcopy
• change call_method to use Ref{ReactionMethod} (reduces time for first do_deriv call)

Bugfix:

• ReactionReservoirConst always define _sms Variable

[codecov-commenter]

Codecov Report

Merging #56 (327ccc9) into main (1703941) will increase coverage by 0.05%. The diff coverage is 55.76%.

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   55.03%   55.08%   +0.05%     
==========================================
  Files          38       38              
  Lines        3807     3814       +7     
==========================================
+ Hits         2095     2101       +6     
- Misses       1712     1713       +1     

Impacted Files	Coverage Δ
src/PALEOboxes.jl	0.00% <0.00%> (ø)
...c/reactionmethods/SetupInitializeUtilityMethods.jl	83.33% <0.00%> (ø)
src/utils/TestUtils.jl	0.00% <0.00%> (ø)
src/ReactionMethod.jl	77.77% <53.33%> (+0.63%)	:arrow_up:
src/VariableReaction.jl	58.29% <77.77%> (+0.97%)	:arrow_up:
src/Model.jl	65.90% <100.00%> (ø)
src/Types.jl	43.47% <100.00%> (+2.56%)	:arrow_up:
src/reactioncatalog/Reservoirs.jl	68.04% <100.00%> (+0.38%)	:arrow_up:
src/reactionmethods/RateStoich.jl	73.43% <100.00%> (+0.30%)	:arrow_up:
... and 1 more

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