unicode-org / icu4x / 8881920599

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Split datetime error paths (#4732)

https://github.com/unicode-org/icu4x/issues/4336

What this PR does
- Stops converting datetime errors into fmt errors
- Use fallback values to continue writing when an error occurs
- Replaces `Writeable` by `TryWriteable` in neo
- Uses lossy mode in non-neo Writeable implementations

What this PR doesn't do
- Use correct gigo values. For now it writes `<ICU4X ERROR>` everywhere.
A domain expert should replace these by sensible values
- Use a narrower error type than `DatetimeError` for `TryWriteable`

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