Classes for managing collections of variable parameters

[ConorMacBride]

Adding classes to help with managing the default parameters of the model classes. The goal is to have a class that can hold arbitrary equations or unevaluated expressions, and evaluate them later when the parameter has been defined a value. There will also be a class that can hold multiple unevaluated expressions. For example,

a = Parameter('x') + 1
a.value = 10
assert a == 11

a = Parameters([Parameter('x') + 1, Parameter('x') + 2])
a.update_parameter('x', 10)
assert a == [11, 12]

Todo

• Test matching values enforced
• Test Parameter repr
• Test Parameter + Parameter gets evaluated

[codecov]

Codecov Report

Merging #38 (1277a37) into main (12bb041) will increase coverage by 0.48%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   94.44%   94.92%   +0.48%     
==========================================
  Files          17       18       +1     
  Lines        1224     1341     +117     
==========================================
+ Hits         1156     1273     +117     
  Misses         68       68              

Impacted Files	Coverage Δ
src/mcalf/utils/collections.py	100.00% <100.00%> (ø)

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