[azopenai] Updating to use the rawjson-as-bytes config option. No code changes. (Azure#23167)

Updating to use the rawjson-as-bytes config option. It doesn't change anything in our client, as it is today, because we've properly typed all 'any' fields.

Also, made Charles a CODEOWNER for this folder.

Fixes Azure#21009

Author: richardpark-msft

.github/CODEOWNERS

@@ -25,7 +25,7 @@
 # AzureSDKOwners: @richardpark-msft
 # ServiceLabel: %OpenAI
 # PRLabel: %OpenAI
-/sdk/ai                       @richardpark-msft @jhendrixMSFT
+/sdk/ai                       @richardpark-msft @jhendrixMSFT @chlowell
 
 # AzureSDKOwners: @jhendrixMSFT
 # ServiceLabel: %Internal

sdk/ai/azopenai/autorest.md

@@ -15,6 +15,7 @@ go: true
 use: "@autorest/[email protected]"
 title: "OpenAI"
 slice-elements-byval: true
+rawjson-as-bytes: true
 # can't use this since it removes an innererror type that we want ()
 # remove-non-reference-schema: true
 ```