reftable/record: introduce function to compare records by key

In some places we need to sort reftable records by their keys to
determine their ordering. This is done by first formatting the keys into
a `struct strbuf` and then using `strbuf_cmp()` to compare them. This
logic is needlessly roundabout and can end up costing quite a bit of CPU
cycles, both due to the allocation and formatting logic.

Introduce a new `reftable_record_cmp()` function that knows how to
compare two records with each other without requiring allocations.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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