Add support for third-party GUI framework plugins #3554

Job	Run time
Pre-commit checks / Pre-commit Checks	48s
Check towncrier / Towncrier Checks	39s
Python package / Create Python Package	1m 0s
Unit tests (macos, 3.8)	2m 18s
Unit tests (macos, 3.9)	2m 22s
Unit tests (macos, 3.10)	1m 51s
Unit tests (macos, 3.11)	2m 23s
Unit tests (macos, 3.12)	2m 28s
Unit tests (ubuntu, 3.8)	1m 26s
Unit tests (ubuntu, 3.9)	1m 44s
Unit tests (ubuntu, 3.10)	1m 8s
Unit tests (ubuntu, 3.11)	1m 12s
Unit tests (ubuntu, 3.12)	1m 49s
Unit tests (windows, 3.8)	2m 9s
Unit tests (windows, 3.9)	2m 2s
Unit tests (windows, 3.10)	2m 9s
Unit tests (windows, 3.11)	3m 22s
Unit tests (windows, 3.12)	3m 39s
Unit tests (windows, winstore3.12, false)	3m 14s
Project coverage	27s
Build app (ppb, macos-latest) / Verify App Build	2m 32s
Build app (ppb, ubuntu-22.04) / Verify App Build	12m 49s
Build app (ppb, windows-latest) / Verify App Build	3m 11s
Build app (pygame, macos-latest) / Verify App Build	3m 38s
Build app (pygame, ubuntu-22.04) / Verify App Build	7m 49s
Build app (pygame, windows-latest) / Verify App Build	3m 40s
Build app (pyside2, ubuntu-22.04) / Verify App Build	4m 30s
Build app (pyside2, windows-latest) / Verify App Build	6m 38s
Build app (pyside6, macos-latest) / Verify App Build	5m 50s
Build app (pyside6, ubuntu-22.04) / Verify App Build	7m 7s
Build app (pyside6, windows-latest) / Verify App Build	4m 15s
Build app (toga, macos-latest) / Verify App Build	6m 46s
Build app (toga, ubuntu-22.04) / Verify App Build	8m 45s
Build app (toga, windows-latest) / Verify App Build	7m 13s
	2h 2m 53s

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