3.x: resolve native-image warnings after Netty upgrade #7084
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Fixes #5878
This PR silences warning from native-image caused by Netty metadata providing reflection entries for Netty classes that depend on optional 3rd party dependencies. We silence those warnings by adding the the third party dependencies to our native image extension -- this way they are not part of a non-native image Java build.
Size of native image. This shows native-image executable size did not grow much with the fix.