[3] Expose media similarity in ListArticles

[MrOrz]

During development, we found that actually it is possible for pure text to have score > 100 .

In this PR, we expose MediaManager's similarity in the edge of ListArticles, so that clients like LINE bot don't need to rely on score to determine if there is a matching, similar image / video / etc file.

Refactors:

• fix(graphql): default total count resolver should only use query in body
  • Ref: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-count.html#search-count-request-body
  • Also adds console.error that prints the whole error message to aid debugging

[MrOrz]

Current dependencies on/for this PR:

• refactor-ai-resp
  • PR #309
  • PR #315 👈
    • PR #313

This comment was auto-generated by Graphite.

[coveralls]

coverage: 88.376% (+0.03%) from 88.348% when pulling a8cca5a54fdde2d3d1a29edd89aed4911c733719 on media-similarity into 34ed2cd39f15b3606de95619f720400a15c754b1 on ai-transcript.