Alignment of Icon in Header of Collapsible Panel

[JCalabretta-MaxetaTech]

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Current behavior
After upgrading from primeng 8.1.1 to 12.2.1 the icon to collapse the panels are on the right side. There doesn't seem to be an easy way to put them back on the left that doesn't break the additional content of the headers.

Expected behavior
There should be a way to set the position of the icon.

What is the motivation / use case for changing the behavior?
So that the display of the app is the same after upgrading.

Please tell us about your environment:

• Angular version:
  12.2.6

• PrimeNG version:
  12.2.1

• Browser: all

• Language: all

• Node (for AoT issues): node --version = 12.14.0