Adds boilerplate for /-/ml/models/{model_id}

What does this MR do and why?

Boilerplate for /-/ml/models/{model_id}

Adds backend and frontend boilerplate code for GET /-/ml/models/{id}. The goal of this MR is not to implement UX or features, just setup the page rendering itself. The page currently only displays the name of the model.

How to set up and validate locally

1. On rails console, enable the feature flag and create some data

   Feature.enable("model_registry")
   p = Project.find_by(id: 20) # or whatever project you want to use for testing
   Ml::FindOrCreateModelService.new(p, "model_0").execute

2. Navigate to {project}/-/ml/models/{model.id}

Database

SELECT
    "ml_models".*
FROM
    "ml_models"
WHERE
    "ml_models"."project_id" = 20
    AND "ml_models"."id" = 22
LIMIT 1

Local explain (5k+ entries):

Limit  (cost=0.28..2.30 rows=1 width=40) (actual time=0.013..0.014 rows=1 loops=1)
  ->  Index Scan using ml_models_pkey on ml_models  (cost=0.28..2.30 rows=1 width=40) (actual time=0.013..0.013 rows=1 loops=1)
        Index Cond: (id = 22)
        Filter: (project_id = 20)

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.