strptime_format type hint should accept lists

[Gautzilla]

🐋 Whatsat?

A while back I switched the strptime_format of the BaseFile constructor to a str | list[str] type, when the first matching format of the list would be used.

However, the type hints remained str elsewhere, e.g. in AudioDataset.from_folder(). Since the use of a list could be of interest here (and it works), I should make all type hints accept list[str].

🐳 Usage exemple

Let's say I have the following audio files with a really messy timezone parsing:

file name	actual timestamp
2024_02_24_19_56_18_000000+0100.wav	2024_02_24_18_56_18_000000+0000
2024_02_24_19_56_28_000000+0100.wav	2024_02_24_18_56_28_000000+0000
2024_02_24_18_56_38_000000.wav	2024_02_24_18_56_38_000000+0000
2024_02_24_18_56_48_000000.wav	2024_02_24_18_56_48_000000+0000
2024_02_24_20_56_58_000000+0200.wav	2024_02_24_18_56_58_000000+0000
2024_02_24_20_57_08_000000+0200.wav	2024_02_24_18_57_08_000000+0000
2024_02_24_18_57_18_000000+0000.wav	2024_02_24_18_57_18_000000+0000
2024_02_24_19_57_28_000000+0100.wav	2024_02_24_18_57_28_000000+0000
2024_02_24_21_57_38_000000+0300.wav	2024_02_24_18_57_38_000000+0000
2024_02_24_18_57_48_000000+0000.wav	2024_02_24_18_57_48_000000+0000
2024_02_24_19_57_58_000000+0100.wav	2024_02_24_18_57_58_000000+0000
2024_02_24_18_58_08_000000+0000.wav	2024_02_24_18_58_08_000000+0000

If I want to convert all (both tz-aware and tz-naive) files to UTC, I could do:

ads = AudioDataset.from_folder(
    Path(r"..."),
    strptime_format=["%y_%m_%d_%H_%M_%S_%f%z","%y_%m_%d_%H_%M_%S_%f"],
    timezone="UTC",
    mode="files"
)

The static analyses atm warns me about strptime_format being a list[str] but it works as intended: files will be correctely parsed as being continuous in the UTC timezone.