Metadata address support for kotlin, Javascript, etc

[iramiller]

Summary

Metadata addresses provide a lot of information in their byte arrays. While the information inside is available with response info message it would be helpful for other languages if there were examples for parsing these values.

Problem Definition

Parsing the bytes of a metadata address requires a list of the type codes and structures used. Currently this information is only available in the golang source.

Proposal

For the metadata module add a couple example classes (one Javascript, one Kotlin) that can be compiled in or included in a third party application in order to parse or generate these identifiers

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned