Add a dictionary of links to AvailabilityState.

[agorajek]

Summary

This feature allows to integrate our AvailabilityStates with external tools, such as data visualizations. For example... when a new availability state is added or updated, we can submit additional urls that can be shown on the Materialization tab of the node.

This PR adds:

• the API call to save the additional links information,
• the adjustment to the UI to show the links together with the Materialized Datasets

Example:

Test Plan

• [ ] PR has an associated issue: #
• [ ] make check passes
• [ ] make test shows 100% unit test coverage

Deployment Plan

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[agorajek]

This is awesome and is going to really unlock the seamless end to end dev flow we've been working towards. Huge thanks @agorajek. One thing I was wondering is if we should expect cases where someone wants to add links but not necessarily attach it to the materialization for a node. For example if a metric node has a doc that might be useful to link out to. I think it's enough to suggest they just put it in the metric description but just wanted to get your thoughts on that.

I think we will want to have "links" in various places. This one is specific to the Availability State / MaterializedDataset, hence I added it on that entity. In the case of other links I think we should place them as close to the proper entity as possible. Because metric nodes (an all nodes) have a description that's a good place to add a doc link, but I can see having a generic links field on the nodes as well. This way the integrations with other tools are easier to pull off.