* Also log as warning when the state lowers

* Allow a retry after 30s in case of peer or network congestion.
* Addresses RIPD-1870
* (Changes levelization. That is not desirable, and will need to be
  fixed.)

* Allow a retry after 15s in case of peer or network congestion.
* Collate duplicate TMGetLedger requests:
  * The requestCookie is ignored when computing the hash, thus increasing
    the chances of detecting duplicate messages.
  * With duplicate messages, keep track of the different requestCookies
    (or lack of cookie). When work is finally done for a given request,
    send the response to all the peers that are waiting on the request,
    sending a separate message for each requestCookie.
* Addresses RIPD-1871

* Addresses RIPD-1869

---------

Co-authored-by: Valentin Balaschenko <[email protected]>
Co-authored-by: Ed Hennis <[email protected]>

* When work is done for a given TMGetLedger request, send the
  response to all the peers that are waiting on the request,
  sending one message per peer, including all the cookies and
  a "directResponse" flag indicating the data is intended for the
  sender, too.

* Avoid an unnecessary lookup in CanProcess

* upstream/develop:
  Set version to 2.3.0-b4
  feat(SQLite): allow configurable database pragma values (5135)
  refactor: re-order PRAGMA statements (5140)
  fix(book_changes): add "validated" field and reduce RPC latency (5096)
  chore: fix typos in comments (5094)
  Set version to 2.2.3
  Update SQLite3 max_page_count to match current defaults (5114)

* Add unit tests for to_short_string(base_uint
* Remove duplicated code
* Use type aliases for cookie maps