Improve calculate_variable_from_constraint error messages

[jsiirola]

Fixes # .

Summary/Motivation:

Debugging an IDAES model pointed out that the errors raised by calculate_variable_from_constraint are less informative than they could be. This improves those errors.

Changes proposed in this PR:

• Add variable / constraint names to the exception messages raised by calculate_variable_from_constraint
• Add IterationLimitError (subclass of RuntimeError) to provide more informative exceptions
• Switch errors raised due to a poor initial guess (derivative too close to 0) from RuntimeError to ValueError

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[mrmundt]

One very small grammar issue; besides that, looks good.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (abfedb9) 87.81% compared to head (48a545f) 87.81%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2914   +/-   ##
=======================================
  Coverage   87.81%   87.81%           
=======================================
  Files         770      770           
  Lines       89626    89628    +2     
=======================================
+ Hits        78701    78703    +2     
  Misses      10925    10925           

Flag	Coverage Δ
linux	84.85% <100.00%> (+<0.01%)	⬆️
osx	74.57% <100.00%> (+<0.01%)	⬆️
other	85.02% <100.00%> (+<0.01%)	⬆️
win	82.10% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
pyomo/common/errors.py	100.00% <100.00%> (ø)
pyomo/util/calc_var_value.py	100.00% <100.00%> (ø)

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