crimson/os/seastore/lba: TRIM/CLEANER trans to adjust deltas of

crimson/os/seastore/lba: TRIM/CLEANER trans to adjust deltas of
LBALeafNodes when committing them.

This is to deal with the following scenario:
1. A client transaction modifies the value of the LBALeafNode, but not
   the pladdr but other field;
2. A TRIM/CLEANER transaction modifies the pladdr for the same laddr_t
   concurrently

In the old approach, the client trans may override the pladdr with the
outdated value after the TRIM/CLEANER transaction commits

Signed-off-by: Xuehan Xu <xuxuehan@qianxin.com>