Add duration encoding to TableVectorizer

Normalized profile

What this task asks for

Add a DurationEncoder, duration selector, and duration routing in TableVectorizer. When `resolution="auto"`, `fit` inspects the data to detect the finest level that carries non-trivial information (e.g. if all durations are whole days, resolution is `"day"`). The cyclical components `"sin_of_day"` and `"cos_of_day"` are not included in any resolution level and are only accessible via an explicit `components` list. When `resolution="auto"` and all values are null, the resolution defaults to `"minute"`. `components` must be either the string `"auto"` or a list/tuple of strings. `fit_transform()` rejects non-duration columns with `RejectColumn`. `ToFloat` and `ToStr` reject duration columns.