Move docs-data to source heartbeat API

[dylanratcliffe]

Research

• Docs are generated with: https://github.com/overmindtech/docgen
• JSON is move into docs in this workflow: https://github.com/overmindtech/docs.overmind.tech/blob/main/.github/workflows/docgen.yml
• Which then becomes markdown in this javascript: https://github.com/overmindtech/docs.overmind.tech/blob/main/util/generate-docs.js

We still need a way to extract the nice structured data from the code for docs generation, but we also need this to be able to made available to discovery and therefore as part of the heartbeats

Proposed API

@tphoney Can you please fill this one out?

[tphoney]

➜  workspace git:(full_stack_vscode) ✗ grep -ihor "+overmind:\S*" stdlib-source  | sort | uniq
+overmind:description
+overmind:descriptiveType
+overmind:get
+overmind:link
+overmind:linked-item-query
+overmind:search
+overmind:type
➜  workspace git:(full_stack_vscode) ✗ grep -ihor "+overmind:\S*" aws-source  | sort | uniq
+overmind:descriptiveType
+overmind:get
+overmind:group
+overmind:link
+overmind:list
+overmind:search
+overmind:terraform:method
+overmind:terraform:queryMap
+overmind:type
➜  workspace git:(full_stack_vscode) ✗ grep -ihor "+overmind:\S*" k8s-source  | sort | uniq
+overmind:descriptiveType
+overmind:get
+overmind:group
+overmind:link
+overmind:list
+overmind:search
+overmind:terraform:queryMap
+overmind:terraform:scope
+overmind:type
➜  workspace git:(full_stack_vscode) ✗                                

gives +overmind:description +overmind:descriptiveType +overmind:get +overmind:group +overmind:link +overmind:linked-item-query +overmind:list +overmind:search +overmind:terraform:method +overmind:terraform:queryMap +overmind:terraform:scope +overmind:type

[tphoney]

We could extend the functionality of https://github.com/overmindtech/aws-source/blob/ab5978f87de4d015b4a55758bdae881b507c0967/sources/describe_source.go#L21

adding in the additional fields that were previously tags.