Minor improvements to scaling API

[andrewlee94]

Fixes None

Summary/Motivation:

Based on initial demonstrations of the new scaling tools, a few minor improvements have been suggested.

Changes proposed in this PR:

• Change API of call_submodel_scaler_method to take submodel object instead of string name.

Legal Acknowledgement

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.98%. Comparing base (96237b9) to head (e45968b). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
idaes/core/scaling/custom_scaler_base.py	83.33%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1507 +/- ## ========================================== - Coverage 76.99% 76.98% -0.01% ========================================== Files 382 382 Lines 61993 61992 -1 Branches 10146 10146 ========================================== - Hits 47733 47727 -6 - Misses 11852 11858 +6 + Partials 2408 2407 -1 ```

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