Add better documentation, examples and builer-style API to ByteView

[alamb]

Which issue does this PR close?

Closes #6478

Rationale for this change

Rationale for this change

While working with StringViewArray's downstream in DataFusion, I found it was not always clear that ByteView exists for creating/destructuring with the u128s so I wanted to write some additional documentation
I also found it quite awkward to write the examples (specifically setting the prefix) so I added some BuilderStyle APIs as well

This is what creating ByteViews looks like without the builder APIs :vomit:

let view = ByteView {
   length: 12,
   // convert 4 byte &str to u32
   prefix: u32::from_le_bytes(prefix.as_bytes().try_into().unwrap()),
   buffer_index: 3,
   offset: 42,
};

What changes are included in this PR?

1. Add pointer to GenericByteViewArray from docs
2. Add examples of using ByteView
3. Add builder style APIs to ByteView

Are there any user-facing changes?

There are several new functions on ByteView

[alamb]

This is an example of the kind of improvement the new API allows (aka not having to know to do try_into/unwrap for byte slices

[alamb]

FYI @XiangpengHao

[tustvold]

I like it

[alamb]

Thank you for the review @tustvold

[alamb]

This was actually an invalid ByteView (the length is less than 12 but the prefix is only 4), so I updated the test

[alamb]

Thanks again @tustvold and @XiangpengHao