Add support for :extend-via-metadata in protocol definitions

[zikajk]

Describe the bug Code can not be compiled once defprotocol elect to be extended via per-value metadata.

To Reproduce Steps to reproduce the behavior:

1. Create a CLJD project
2. Try to compile this code:

(defprotocol  MyProtocol :extend-via-metadata true
              (some-fn [this]))

3. See error

Don't know how to create ISeq from: clojure.lang.Keyword
Faulty form (defprotocol MyProtocol :extend-via-metadata true (some-fn [this]))

Expected behavior

• code can be compiled and metadata + protocols can be used.

Additional context

• I have experienced this error when trying to use Honey.SQL in CLJD

[dupuchba]

Thanks for your report @zikajk , indeed, it's not yet implemented in the compiler. We have other immediate priorities but I am tagging this issue as enhancement