[TASK] add way to do subscripts in latex generated documentation

Issue Description

Is your feature request related to a problem? Please describe. Currently we escape underscores in the generateLatex function in InputData so that variable names like this_or_that don't cause latex errors. However, this can be a problem if we have $k_i$

Describe the solution you'd like Make the escaping underscores smarter. One possibility is to detect if we are in math mode. Another is to add a workaround to make things like k_{i} not escape (since a { will never be found in a variable name).

Describe alternatives you've considered Never use subscripts.

For Change Control Board: Issue Review

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

[x] 1. Is it tagged with a type: defect or task?
[x] 2. Is it tagged with a priority: critical, normal or minor?
[x] 3. If it will impact requirements or requirements tests, is it tagged with requirements?
[x] 4. If it is a defect, can it cause wrong results for users? If so an email needs to be sent to the users.
[x] 5. Is a rationale provided? (Such as explaining why the improvement is needed or why current code is wrong.)

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 / raven