Support for AVDL

[cengelman777]

I believe schema registry supports avdl, but this plugin just supports avsc. I see this file here - https://github.com/ImFlog/schema-registry-plugin/blob/master/src/main/kotlin/com/github/imflog/schema/registry/SchemaType.kt#L8, but am not aware how much more work would be involved in getting the plugin to support avdl

[ImFlog]

I believe the maven plugin does not support he IDL format (I once again searched / looked at the code in the confluent inc repository). Happy to be proved wrong though.
I guess this is the same question than #161 and the same answer applies.
Thank you for the interest, closing this but do not hesitate to comment / reopen if you find evidences.