runtime: remove tag_checker

Deprecated on 3.9:

`tag_checker` used to be meant for cases where you've gotten an unsorted
tag vector (mostly, from `get_tags_in_range`), which you then had to go
through in parallel to your samples, to check which tag applies at what
sample.

For that it sorts the tags; the tags coming from the `get_tags*` functions
are sorted already

The checking pattern (which `chunks_to_symbols` is the last consumer of)
is inefficient: instead of taking the index of the first unprocessed tag
and processing all samples up to that index, a check is performed on
every sample, which includes calls and multiple indirections.

So, since very likely nobody uses this, and because it's a design
anti-pattern, deprecating this on 3.9 and removing it with 3.10.

Signed-off-by: Marcus Müller <mmueller@gnuradio.org>

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