Update for KeyVault CODEOWNERS (Azure#2839)

* Update for KeyVault CODEOWNERS

This adds the `azure-sdk-write-keyvault` team as code owners.

* Update .github/CODEOWNERS

Co-authored-by: Ronnie Geraghty  <[email protected]>

* Include Heath and fix whitespace.

---------

Co-authored-by: Ronnie Geraghty <[email protected]>

Author: adarce

.github/CODEOWNERS

@@ -65,6 +65,11 @@
 # PRLabel: %Cosmos
 /sdk/cosmos/             @analogrelay @Pilchie @kirankumarkolli @tvaron3 @FabianMeiswinkel @kundadebdatta @nehrao1 @kushagraThapar
 
+# ServiceOwner: @Azure/azure-sdk-write-keyvault
+# ServiceLabel: %KeyVault
+# PRLabel: %KeyVault
+/sdk/keyvault/           @Azure/azure-sdk-write-keyvault @heaths
+
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