This PR was merged into the 4.3 branch. Discussion ---------- [Messenger] Updating messenger docs for 4.3 Hi! This rewrites the docs for Messenger for 4.3. Code was tested as I wrote it, however, any reviews are warmly welcomed as there are many details. Btw, I'm experimenting with a new (but not crazy) idea with the messenger docs, which is: A) To mostly favor in big document, but still isolate bigger, more complex "how to" topics to other documents B) To think critically about the top level (h2) and secondary level (h3) headlines and let that guide the docs. The reason is that these are what show up on the left sidebar of the docs (https://symfony.com/doc/4.1/messenger.html) and I think we should control what this looks like in a purposeful way. Here is the hierarchy for these new docs: ``` - Installation - Creating a Message & Handler - Dispatching the Message - Transports: Async/Queued Messages - Routing Messages to a Transport - Doctrine Entities in Messages - Handling Messages Synchronously - creating your own transport [External] - Consuming Messages (Running the Worker) - Deploying to Production - Prioritized Transports - Supervisor Configuration - Retries & Failure - Avoiding Retry on an Error - Saving & Retrying Failed Messages - Transport Configuration - amqp Transport - doctrine Transport - redis Transport - in-memory Transport - Serializing Messages - Customizing Handlers - Manually Configuring the Handler - Handler Subscriber & Options - Sending Handlers to Different Transports - Extending Messenger - Envelopes - Disabling default Middleware - Adding your own Middleware - Middleware for Doctrine - Events - Multiple Buses, Command & Event Buses - Learn More ``` Closes #11236 Closes #10281 Closes #10279 Closes #9662 Closes #9651 Closes #9639 Commits ------- 3e67080 Updating messenger docs for 4.3

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