[Feature request] SubtitlesClip duration arg into make_textclip #2515

[Hammad-Hassan61]

• [✓] I have provided code that clearly demonstrates the bug and that only works correctly when applying this fix
• [ ✓] I have added suitable tests demonstrating a fixed bug or new/changed feature to the test suite in tests/
• [ ✓] I have properly documented new or changed features in the documentation or in the docstrings
• [ ✓] I have properly explained unusual or unexpected code in the comments around it