Report an out-of-range duration as invalid instead of erroring

[c-tonneslan]

Fixes #1511.

The duration format checker registers raises=isoduration.DurationParsingException, but isoduration parses components with decimal.Decimal, so an extreme value like "P1E1000000D" raises decimal.Overflow (a decimal.DecimalException / ArithmeticError) instead. That escaped the format checker uncaught rather than the instance being reported invalid.

This adds decimal.DecimalException to the raises tuple, so such an instance is treated as an invalid duration (the checker returns False / raises FormatError) rather than propagating a decimal error.

Added a regression test in test_format.py (skipped when isoduration isn't installed). ruff and the format test suite pass. Happy to add a CHANGELOG entry if you'd like one.

[read-the-docs-community]

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