Lazily constructing cost attribute blocks

[bknueven]

Fixes/Resolves: Towards #676

Summary/Motivation:

The number of typically unused parameters on the WaterTAP Costing block can be confusing to users. This PR would delay construction of those parameters until they are used.

Changes proposed in this PR:

• Add LazyBlock and LazyBlockMixin to facilitate on-demand block construction
• Use LazyBlocks for WaterTAPCosting parameters.

Discussion:

• This may be too clever for our use-case -- the unit model costing methods could just call-out to construct the block themselves
• Conversely, if we do not implement something like this PR, then any user implementing their own costing method utilizing the global parameters needs to know to call the parameter block construction.
• We could "meet in the middle" and not have these blocks constructed on access, but instead via some method call.

Legal Acknowledgement

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1. I agree my contributions are submitted under the license terms described in the LICENSE.txt file at the top level of this directory.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

Merging #740 (b1ceea9) into main (92f6ab3) will decrease coverage by 0.95%.
The diff coverage is 100.00%.

❗ Current head b1ceea9 differs from pull request most recent head 437e85f. Consider uploading reports for the commit 437e85f to get more accurate results

@@            Coverage Diff             @@
##             main     #740      +/-   ##
==========================================
- Coverage   95.63%   94.67%   -0.96%     
==========================================
  Files         254      221      -33     
  Lines       24342    20767    -3575     
==========================================
- Hits        23280    19662    -3618     
- Misses       1062     1105      +43     

Impacted Files	Coverage Δ
watertap/core/__init__.py	100.00% <100.00%> (ø)
watertap/core/lazy_block.py	100.00% <100.00%> (ø)
watertap/costing/watertap_costing_package.py	100.00% <100.00%> (+1.19%)	⬆️
...ies/wastewater_resource_recovery/metab/metab_ui.py	0.00% <0.00%> (-100.00%)	⬇️
...tudies/wastewater_resource_recovery/metab/metab.py	89.03% <0.00%> (-10.53%)	⬇️
watertap/core/zero_order_costing.py	90.93% <0.00%> (-7.80%)	⬇️
watertap/unit_models/uv_aop.py	94.69% <0.00%> (-2.19%)	⬇️
watertap/property_models/ion_DSPMDE_prop_pack.py	91.61% <0.00%> (-0.96%)	⬇️
...heets/full_treatment_train/analysis/multi_sweep.py	79.67% <0.00%> (-0.82%)	⬇️
...trient_removal/electrochemical_nutrient_removal.py	99.04% <0.00%> (-0.22%)	⬇️
... and 112 more

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[bknueven]

As part of, or maybe before, the way flows cost attributes are created should be reconsidered with IDAES/idaes-pse#983.

[bknueven]

Closing in favor of #835.