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GH-41179: [Docs] Documentation for Dissociated IPC Protocol (#41180)



### Rationale for this change
Adding documentation for the Experimental Dissociated IPC Protocol for splitting arrow IPC metadata and body data into separate streams for use with newer transports such as UCX and Libfabric.

The relevant mailing list discussion and vote: https://lists.apache.org/thread/k26n1h90b1wy1w5k53whh0t8o4nd0yx7

### What changes are included in this PR?
Only documentation changes and images for the Arrow docs site.

I tagged people I thought might be relevant for reviewing, but feel free to tag and add anyone else that might seem relevant to reviewing this. Thanks!
* GitHub Issue: #41179

Lead-authored-by: Matt Topol <zotthewizard@gmail.com>
Co-authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Co-authored-by: Antoine Pitrou <pitrou@free.fr>
Signed-off-by: Matt Topol <zotthewizard@gmail.com>