Finish the Avro codec

[vigoo]

Problems:

• Some of its tests are failing
• It is not implementing the Codec trait

[mjabari]

I've looked at the code. I think the main issue here is Union in Avro schema

Unions, as mentioned above, are represented using JSON arrays. For example, ["null", "string"] declares a schema which may be either a null or string.

so we'll loose structure in a roundtrip.
although there are other open issues and a WIP for it

[rajcspsg]

@vigoo @mjabari I would like to work on this issue

[jdegoes]

/bounty $250

[algora-pbc]

💎 $250 bounty • ZIO

Steps to solve:

1. Start working: Comment /attempt #309 with your implementation plan
2. Submit work: Create a pull request including /claim #309 in the PR body to claim the bounty
3. Receive payment: 100% of the bounty is received 2-5 days post-reward. Make sure you are eligible for payouts

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[vidyasankarv]

@rajcspsg if you are not working on this, I would like to try

[rajcspsg]

@vidyasankarv please go ahead!!!

[vidyasankarv]

#563 @devsprint Looks like your PR for AVRO codec on ZIO Schema might be eligible for this bounty