Kent Overstreet f7b6ca23b6 bcachefs: BTREE_ITER_WITH_KEY_CACHE
This is the start of cache coherency with the btree key cache - this
adds a btree iterator flag that causes lookups to also check the key
cache when we're iterating over the btree (not iterating over the key
cache).

Note that we could still race with another thread creating at item in
the key cache and updating it, since we aren't holding the key cache
locked if it wasn't found. The next patch for the update path will
address this by causing the transaction to restart if the key cache is
found to be dirty.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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