[connector/spanmetrics] Added @portertech to codeowners (#30401)

Added @portertech (me) to connector/spanmetrics codeowners.

Supporters: @djaglowski, @albertteoh 

Recent relevant PR:
#29711

Signed-off-by: Sean Porter <portertech@gmail.com>

connector/spanmetricsconnector/README.md

@@ -5,7 +5,7 @@
 | ------------- |-----------|
 | Distributions | [contrib], [grafana], [liatrio], [splunk], [sumo] |
 | Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Aconnector%2Fspanmetrics%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Aconnector%2Fspanmetrics) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Aconnector%2Fspanmetrics%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Aconnector%2Fspanmetrics) |
-| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@albertteoh](https://www.github.com/albertteoh) |
+| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@albertteoh](https://www.github.com/albertteoh), [@portertech](https://www.github.com/portertech) |
 
 [alpha]: https://github.com/open-telemetry/opentelemetry-collector#alpha
 [contrib]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-contrib

connector/spanmetricsconnector/metadata.yaml

@@ -6,4 +6,4 @@ status:
     alpha: [traces_to_metrics]
   distributions: [contrib, sumo, grafana, splunk, liatrio]
   codeowners:
-    active: [albertteoh]
+    active: [albertteoh, portertech]