Replaced transform function

[meetagrawal09]

Description

The aim of this PR is to replace the use of transform()
This PR fixes #2961

Motivation and Context

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• My name is in the list of CITATION.cff
• I have updated the CHANGELOG.md.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[meetagrawal09]

Further occurrences of the transform function appear in pecan.models.maat and pecan.modules.priors
In these can we consider importing the dplyr package and using the mutate function to solve the issue ?

@Aariq any specific reason for doing the below for packages not importing dplyr ( anything affecting efficiency ? ):
Reference #2961comment

new_df <- old_df
new_df$new_col <- new_df$old_col * 2

Asking this because mutate() seems to be more intuitive while reading code

[Aariq]

@Aariq any specific reason for doing the below for packages not importing dplyr ( anything affecting efficiency ? ): Reference #2961comment

Just that it's sometimes a good idea to minimize the number of dependencies a package has.

[meetagrawal09]

All instances of transform() have been replaced
This PR is ready for a review

[infotroph]

This is looking very good! Is it ready for full review or are you still adding changes?

Edit: you answered that above! approving now.

[infotroph]

I'm amused that the transform's in this file were obviously intended to "save typing" but most of these lines are shorter without it!