resolved-ts: track the number of locks of large txns in resolver (tik…

…v#17629)

ref tikv#17459

Track the number of locks of large txns in resolver

Signed-off-by: ekexium <[email protected]>

Co-authored-by: ti-chi-bot[bot] <108142056+ti-chi-bot[bot]@users.noreply.github.com>