complete FuzzyReleaseMatcher refactoring

We keep the name, since the api - "matcher.match(release)" - is the
same; simplified queries; at most one query is performed against
elasticsearch; parallel release retrieval from the API; optional support
for release year windows;

Test cases are expressed in yaml and will be auto-loaded from the
specified directory; test work against the current search endpoint,
which means the actual output may change on index updates; for the
moment, we think this setup is relatively simple and not too unstable.

    about: title contrib, partial name
    input: >
      {
        "contribs": [
          {
            "raw_name": "Adams"
          }
        ],
        "title": "digital libraries",
        "ext_ids": {}
      }
    release_year_padding: 1
    expected:
      - 7rmvqtrb2jdyhcxxodihzzcugy
      - a2u6ougtsjcbvczou6sazsulcm
      - dy45vilej5diros6zmax46nm4e
      - exuwhhayird4fdjmmsiqpponlq
      - gqrj7jikezgcfpjfazhpf4e7c4
      - mkmqt3453relbpuyktnmsg6hjq
      - t2g5sl3dgzchtnq7dynxyzje44
      - t4tvenhrvzamraxrvvxivxmvga
      - wd3oeoi3bffknfbg2ymleqc4ja
      - y63a6dhrfnb7bltlxfynydbojy

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