feat: add Rust runtime example (#188)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: moritzzimmer

.gitignore

@@ -6,6 +6,7 @@ terraform.tfstate.backup
 bin/
 build/
 obj/
+target/
 .gradle/
 .idea
 **/.DS_Store

README.md

@@ -351,6 +351,7 @@ see [examples](examples/deployment) for details.
   - [go](examples/runtimes/go)
   - [java](examples/runtimes/java)
   - [python](examples/runtimes/python)
+  - [rust](examples/runtimes/rust)
 - [with-cloudwatch-event-rules](examples/with-cloudwatch-event-rules)
 - [with-efs](examples/with-efs)
 - [with-event-source-mappings](examples/with-event-source-mappings)