fix: allow 'N {interval} from now' (#502)

[jakeogh]

This is a copy of PR #642 which fixes #502. I'm not sure why it was closed, or if this is the right way to re-submit it. Afaict it's a general fix that works in all cases.

Before:

$ python -c "from dateparser import parse; from datetime import datetime ; print(parse('in 2 days', settings={'RELATIVE_BASE': datetime.now()}))"
2025-05-19 00:34:29.964320

$ python -c "from dateparser import parse; from datetime import datetime ; print(parse('2 days fron now', settings={'RELATIVE_BASE': datetime.now()}))"
None

After:

$ python -c "from dateparser import parse; from datetime import datetime ; print(parse('in 2 days', settings={'RELATIVE_BASE': datetime.now()}))"
2025-05-19 00:34:29.964320

$ python -c "from dateparser import parse; from datetime import datetime ; print(parse('2 days fron now', settings={'RELATIVE_BASE': datetime.now()}))"
2025-05-19 00:34:29.964320