add shared_recording example

examples/rust/shared_recording/Cargo.toml

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+[package]
+name = "shared_recording"
+version = "0.12.0-alpha.1+dev"
+edition = "2021"
+rust-version = "1.72"
+license = "MIT OR Apache-2.0"
+publish = false
+
+[dependencies]
+rerun = { path = "../../../crates/rerun" }

examples/rust/shared_recording/README.md

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+---
+title: Shared Recording 
+python: https://github.com/rerun-io/rerun/tree/latest/examples/python/shared_recording/main.py
+---
+
+<picture>
+  <img src="https://static.rerun.io/shared_recording/c3da85f1d4c158b8c7afb6bd3278db000b58049d/full.png" alt="">
+  <source media="(max-width: 480px)" srcset="https://static.rerun.io/shared_recording/c3da85f1d4c158b8c7afb6bd3278db000b58049d/480w.png">
+  <source media="(max-width: 768px)" srcset="https://static.rerun.io/shared_recording/c3da85f1d4c158b8c7afb6bd3278db000b58049d/768w.png">
+  <source media="(max-width: 1024px)" srcset="https://static.rerun.io/shared_recording/c3da85f1d4c158b8c7afb6bd3278db000b58049d/1024w.png">
+  <source media="(max-width: 1200px)" srcset="https://static.rerun.io/shared_recording/c3da85f1d4c158b8c7afb6bd3278db000b58049d/1200w.png">
+</picture>
+
+This example demonstrates how to use `RecordingId`s to create a single shared recording across multiple processes.
+
+Run the following multiple times, and you'll see that each invokation adds data to the existing recording rather than creating a new one:
+```bash
+cargo run
+```

examples/rust/shared_recording/src/main.rs

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+//! Demonstrates how to use `RecordingId`s to build a single recording from multiple processes.
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let rec = rerun::RecordingStreamBuilder::new("rerun_example_shared_recording")
+        .recording_id("my_shared_recording")
+        .spawn()?;
+
+    rec.log(
+        "updates",
+        &rerun::TextLog::new(format!("hello from process #{}", std::process::id())),
+    )?;
+
+    Ok(())
+}