[PR] [improve] PIP-384: ManagedLedger interface decoupling [pulsar]

["lhotari (via GitHub)" <gi...@apache.org>]

lhotari opened a new pull request, #23363:
URL: https://github.com/apache/pulsar/pull/23363

   ### Motivation
   
   Apache Pulsar uses a component called ManagedLedger to handle persistent storage of messages.
   
   The ManagedLedger interfaces and implementation were initially tightly coupled, making it difficult to introduce alternative implementations or improve the architecture.
   This PIP documents changes that have been made in the master branch for Pulsar 4.0. Pull Requests [#22891](https://github.com/apache/pulsar/pull/22891) and [#23311](https://github.com/apache/pulsar/pull/23311) have already been merged.
   This work happened after lazy consensus on the dev mailing list based on the discussion thread ["Preparing for Pulsar 4.0: cleaning up the Managed Ledger interfaces"](https://lists.apache.org/thread/l5zjq0fb2dscys3rsn6kfl7505tbndlx).
   There is one remaining PR [#23313](https://github.com/apache/pulsar/pull/23313) at the time of writing this document.
   The goal of this PIP is to document the changes in this area for later reference.
   
   ### Documentation
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   - [x] `doc` <!-- Your PR contains doc changes. -->
   - [ ] `doc-required` <!-- Your PR changes impact docs and you will update later -->
   - [ ] `doc-not-needed` <!-- Your PR changes do not impact docs -->
   - [ ] `doc-complete` <!-- Docs have been already added -->


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