Add coil model, plus validation and example

[AntoineGautier]

This closes #1109.

Note that the original validation model in Buildings Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTU uses Buildings.Fluid.HeatExchangers.WetCoilCounterFlow as a reference.
That reference was removed in this PR to avoid merging the latter model that does not exist in IBPSA.
When simulating the validation model, the user has no other way than looking at the referenced publication to check the model accuracy.

EDIT: For reference, I also include here the links to the review in MBL that shows the parts of the code that are duplicated from existing classes and which would benefit from a refactoring: see lbl-srg/modelica-buildings#2364 (comment) and lbl-srg/modelica-buildings#2364 (comment).

[AntoineGautier]

@Mathadon This is ready on my end. Would you want to do the review?

[Mathadon]

@AntoineGautier I will do the review. It may take a few days, though!

[Mathadon]

Just a remark: This model relies on a dew point calculation and a wet bulb temperature calculation. Both result in an algebraic loop. If we would reimplement those functions then this model could possibly require less computation time.

[Mathadon]

Nice work! I did not review all model equations in detail again. I presume they are correct since the results look ok. Some minor suggestions in my review. Thanks!

[AntoineGautier]

@Mathadon Thanks for the review! I addressed your comments in my last commits and left unresolved the major ones for you to double check.

[Mathadon]

I think that all issues are resolved. This can be merged as far as I am concerned.

[AntoineGautier]

This is ready to merge once the CI tests pass and the changes in lbl-srg/modelica-buildings#2780 (review) are accepted by @mwetter.
@Mathadon Could you please approve the PR through the GH review workflow?

[mwetter]

Ready to merge after the CI tests pass.