[chore][exporter/rabbitmq] Add missing code owner (#32984)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
@atoulme [volunteered to be the
sponsor](#28891 (comment))
of this component, so I believe he should be listed as a code owner.

From
[CONTRIBUTING.md](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#adding-new-components):
```
A sponsor is an approver who will be in charge of being the official reviewer of the code and become a code owner for the component.
```

**Link to tracking Issue:** <Issue number if applicable>
#28891

.github/CODEOWNERS

@@ -73,7 +73,7 @@ exporter/otelarrowexporter/                              @open-telemetry/collect
 exporter/prometheusexporter/                             @open-telemetry/collector-contrib-approvers @Aneurysm9
 exporter/prometheusremotewriteexporter/                  @open-telemetry/collector-contrib-approvers @Aneurysm9 @rapphil
 exporter/pulsarexporter/                                 @open-telemetry/collector-contrib-approvers @dmitryax @dao-jun
-exporter/rabbitmqexporter/                               @open-telemetry/collector-contrib-approvers @swar8080
+exporter/rabbitmqexporter/                               @open-telemetry/collector-contrib-approvers @swar8080 @atoulme
 exporter/sapmexporter/                                   @open-telemetry/collector-contrib-approvers @dmitryax @atoulme
 exporter/sentryexporter/                                 @open-telemetry/collector-contrib-approvers @AbhiPrasad
 exporter/signalfxexporter/                               @open-telemetry/collector-contrib-approvers @dmitryax @crobert-1

exporter/rabbitmqexporter/README.md

@@ -5,7 +5,7 @@
 | Stability     | [development]: traces, metrics, logs   |
 | Distributions | [] |
 | Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Aexporter%2Frabbitmq%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Aexporter%2Frabbitmq) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Aexporter%2Frabbitmq%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Aexporter%2Frabbitmq) |
-| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@swar8080](https://www.github.com/swar8080) |
+| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@swar8080](https://www.github.com/swar8080), [@atoulme](https://www.github.com/atoulme) |
 
 [development]: https://github.com/open-telemetry/opentelemetry-collector#development
 <!-- end autogenerated section -->

exporter/rabbitmqexporter/metadata.yaml

@@ -7,7 +7,7 @@ status:
     development: [traces, metrics, logs]
   distributions: []
   codeowners:
-    active: [swar8080]
+    active: [swar8080, atoulme]
 
 tests:
   skip_lifecycle: true