SfxPoolItem: introduce StaticWhichCast and DynamicWhichCast

- at least in Writer it is a common pattern to switch case on a Which
and then static_cast the SfxPoolItem to the assumed "right" type
- instead, it would much less errorprone to use the TypedWhichId to be
sure to cast to the right, matching type for an id
- also, this allow to assert the dynamic_cast in debug build to
highlight type confusion
- finally, there is some example use added in sw showing how it gets rid
of explicit manual lookup of the type to cast to
- likely, many of the static_cast<TypedWhichId>(SfxPoolItem*) can be
found and replaced with a compiler plugin. This is left as an exercise
to the reader.
- alternatively, this might be a nice easy EasyHack to start ....

Change-Id: I00110c0fe25626bc89d835e3c4e7ff75839756b0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/109042
Tested-by: Jenkins
Reviewed-by: Bjoern Michaelsen <bjoern.michaelsen@libreoffice.org>

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