Merge bitcoin/bitcoin#29402: mempool: Log added for dumping mempool transactions to disk

4d5b55735bcf82847d748d24da5dbdbd1de8ef41 log: renamed disk to file so wording was more accurate (kevkevin)
b9f04be870c948f071216fba8402a2c5395a336b mempool: Log added for dumping mempool transactions to disk (kevkevin)

Pull request description:

  Sometimes when shutting off bitcoind it can take a while to dump the mempool transaction onto the disk so
  this change adds additional logging to the `DumpMempool` method in `kernel/mempool_persist.cpp`

  Motivated by https://github.com/bitcoin/bitcoin/pull/29227 this change
   - adds a single new line for the amount of transactions being dumped and the amount of memory being dumped to file

  This is in response to https://github.com/bitcoin/bitcoin/pull/29227#issuecomment-1893375082

  The logs will now look like this
  ```
  2024-02-09T23:41:52Z DumpAnchors: Flush 2 outbound block-relay-only peer addresses to anchors.dat completed (0.02s)
  2024-02-09T23:41:52Z scheduler thread exit
  2024-02-09T23:41:52Z Writing 29 mempool transactions to file...
  2024-02-09T23:41:52Z Writing 0 unbroadcast transactions to file.
  2024-02-09T23:41:52Z Dumped mempool: 0.000s to copy, 0.022s to dump, 0.015 MB dumped to file
  2024-02-09T23:41:52Z Flushed fee estimates to fee_estimates.dat.
  2024-02-09T23:41:53Z Shutdown: done
  ```

ACKs for top commit:
  maflcko:
    cr-ACK 4d5b55735bcf82847d748d24da5dbdbd1de8ef41
  glozow:
    reACK 4d5b557

Tree-SHA512: 049191e140d00c1ea57debe0138f1c9eb0f9bb0ef8138e2568e6d89e64f45a5d5853ce3b9cc0b28566aab97555b47ddfb0f9199fc8cea6b81e53f50592d5ae6a

0 files changed, 0 insertions, 0 deletions