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box: remove collation from tuple format

It's possible to set a collation for a space format field, in which case
it will be used as the default collation when creating an index over
this field. Also, it's used for comparison of tuple fields in SQL.
We store a collation id not only in space_def but also in tuple_format,
but it's redundant because in all places where we use it, we have
a space_def object. Let's remove coll_id and coll from tuple_format
and use field_def::coll_id instead. This a step towards allowing
application threads to use tuple formats because now we don't need to
access the global collation cache to create a tuple format.

Needed for #12210

NO_DOC=code cleanup
NO_TEST=code cleanup
NO_CHANGELOG=code cleanup

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