Add implementation for Abstract Interface from GTO

[aguschin]

Create implementation for Abstract Interface in GTO iterative/gto#46

• Input: artifact path
• Output: all details + their text representation

There are two use cases for this:

1. API - Studio BE calls this API, gets relevant MLEM and DVC representations and parse them
2. CLI - $ gto describe artifact should print human-readable description of info MLEM could provide

[aguschin]

@mike0sv, I can start drafting this on both sides, but let's discuss this briefly first.

[mike0sv]

I'm thinking I can kickstart those drafts and this will be faster. But I need to finish #166 first

[aguschin]

Closing it. The fate of GTO enrichments will be decided eventually after dql is developed, but no need to keep this issue - we have the same in GTO repo. Can reopen in case this will be needed.