feat(scopes): add scopes retrieval service

[larcin]

Usage:

import { scopeManager } from 'forest-express';

// With user being the one from the request and `environments` being the collectionName
const scopes = await scopeManager.getScopeForUser(user, 'environments');

Format (only collections having scopes are retrieved):

{
  aggregator: 'and',
  conditions: [
    {
      field: 'type',
      operator: 'equal',
      value: 'production',
    },
  ],
}

Pull Request checklist:

• Write an explicit title for the Pull Request, following Conventional Commits specification
• Test manually the implemented changes
• Review my own code (indentation, syntax, style, simplicity, readability)
• Wonder if you can improve the existing code

[romain-gilliotte]

See comments in files.

• tests are missing :)

[qlty-cloud-legacy]

Code Climate has analyzed commit 9ab6350 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 92.5% (60% is the threshold).

This pull request will bring the total coverage in the repository to 55.3%.

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