HMS-4934: Add modules to introspected data

[jlsherrill]

Summary

Adds module streams as searchable for introspected repos

Testing steps

1. Adjust go.mod to point to your localy checkout of yummy, which should have HMS-4934: Parse module metadata yummy#31

replace github.com/content-services/yummy => /home/jlsherri/git/yummy/

2. go get ./...
3. make db-migrate-up
4. make repos-import
5. go run cmd/external-repos/main.go introspect go run cmd/external-repos/main.go introspect https://cdn.redhat.com/content/dist/rhel8/8/x86_64/appstream/os
6. go run cmd/external-repos/main.go introspect go run cmd/external-repos/main.go introspect https://cdn.redhat.com/content/dist/rhel9/9/x86_64/appstream/os
7. play around with the module streams search api:

#### module streams
POST http://localhost:8000/api/content-sources/v1.0/module_streams/search
x-rh-identity: eyJpZGVudGl0eSI6eyJ0eXBlIjoiVXNlciIsInVzZXIiOnsidXNlcm5hbWUiOiIxIn0sImFjY291bnRfbnVtYmVyIjoiZm9vIiwiaW50ZXJuYWwiOnsib3JnX2lkIjoiMSJ9fX0K
Content-Type: application/json

{"urls":["https://cdn.redhat.com/content/dist/rhel8/8/x86_64/appstream/os"],
  "search":"",
  "rpm_names": []
}

feel free to play with the search and rpm_names

[jlsherrill]

https://issues.redhat.com/browse/HMS-4932

[jlsherrill]

https://issues.redhat.com/browse/HMS-HMS-4932

[jlsherrill]

https://issues.redhat.com/browse/HMS-HMS-4934

[jlsherrill]

https://issues.redhat.com/browse/Fixes HMS-4934

[jlsherrill]

https://issues.redhat.com/browse/HMS-4934

[swadeley]

/retest

[swadeley]

@jlsherrill this failed to build

[jlsherrill]

@swadeley yes, it will fail to build until content-services/yummy#31 is merged and i update it to use the new yummy

[rverdile]

If I search for a stream that doesn't exist, I see null as the response. Would empty list be better? I think that's what I would've expected

[jlsherrill]

good call, fixed

[rverdile]

I noticed if I create and introspect a repository before checking-out this PR, then checkout this PR and re-introspect, the module streams don't get added because the repository hasn't changed (I suspect)

[jlsherrill]

good call, updated!