Add getGcStyle() method to accommodate styling

[ShahzaibIbrahim]

Add getGcStyle() having a default implementation returning SWT.None

[HeikoKlare]

Isn't this a duplicate of #1948?

[github-actions]

Test Results

104 files   -    441  104 suites   - 441   5s ⏱️ - 30m 2s
 63 tests  -  4 304   63 ✅  -  4 292  0 💤  -  12  0 ❌ ±0 
210 runs   - 16 406  210 ✅  - 16 302  0 💤  - 104  0 ❌ ±0 

Results for commit c3c7c18. ± Comparison against base commit a123010.

This pull request removes 4304 tests.

AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_dollarSign
AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_emptyString
AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_letterA
AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_letters
AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16LE_null
AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_AsciiLetters
AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_Asciiletter
AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_LotsOfLetters
AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_letter
AllGTKTests org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_letters
…

[ShahzaibIbrahim]

Isn't this a duplicate of #1948?

Yes, I was trying some stuff in this draft pull request to fix the CI pipeline.