[TASK] Adding capabilities to except pyomo expressions and export as equation expression.

Issue Description

Is your feature request related to a problem? Please describe. This is not related to a problem.

Describe the solution you'd like Accept pyomo expressions as variables and data. The easiest way is to redefine acceptable data types and pass pyomo concrete models in main.py, CashFlows.py, and other files that may be affected.

Describe alternatives you've considered Could replace pyomo syntax into framework.

For Change Control Board: Issue Review

This review should occur before any development is performed as a response to this issue.

[ ] 1. Is it tagged with a type: defect or task? Task
[ ] 2. Is it tagged with a priority: critical, normal or minor? normal
[ ] 3. If it will impact requirements or requirements tests, is it tagged with requirements? Requires not to affect existing tests.
[ ] 4. If it is a defect, can it cause wrong results for users? If so an email needs to be sent to the users. No, it is not.
[ ] 5. Is a rationale provided? (Such as explaining why the improvement is needed or why current code is wrong.) Yes.

For Change Control Board: Issue Closure

This review should occur when the issue is imminently going to be closed.

[x] 1. If the issue is a defect, is the defect fixed?
[x] 2. If the issue is a defect, is the defect tested for in the regression test system? (If not explain why not.)
[x] 3. If the issue can impact users, has an email to the users group been written (the email should specify if the defect impacts stable or master)?
[x] 4. If the issue is a defect, does it impact the latest release branch? If yes, is there any issue tagged with release (create if needed)?
[x] 5. If the issue is being closed without a pull request, has an explanation of why it is being closed been provided?

idaholab / TEAL