Mark AzureKeyVaultProvider as trimmable, enable NativeAOT support (#3401)

Author: edwardneal

src/Microsoft.Data.SqlClient/add-ons/AzureKeyVaultProvider/Microsoft.Data.SqlClient.AlwaysEncrypted.AzureKeyVaultProvider.csproj

@@ -15,6 +15,8 @@
     <BuildProjectReferences>false</BuildProjectReferences>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
+    <IsTrimmable Condition="'$(TargetGroup)'=='netcoreapp'">true</IsTrimmable>
+    <IsAotCompatible Condition="'$(TargetGroup)'=='netcoreapp'">true</IsAotCompatible>
   </PropertyGroup>
   <!--Generating Strong Name-->
   <PropertyGroup Condition="'$(CDP_BUILD_TYPE)'=='Official'">