file.external_identifer can be an array of strings

[iisa]

ex. https://archive.org/metadata/cd_taylor-swift_taylor-swift
has file info with a list of external_identifiers

{
"name": "disc1/01. Taylor Swift - Tim McGraw.flac",
"source": "original",
"mtime": "1515314129",
"size": "28581095",
"md5": "748e4988def50a1d271007d9855665fa",
"crc32": "4873b495",
"sha1": "f65a750cf86b87f43d4117e87f8b0271744b3036",
"format": "Flac",
"length": "234.55",
"height": "640",
"width": "640",
"private": "true",
"album": "Taylor Swift",
"comment": "https://archive.org/details/cd_taylor-swift_taylor-swift",
"title": "Tim McGraw",
"artist": "Taylor Swift",
"track": "1",
"external-identifier": [
"urn:acoustid:c1b6f24a-d9c3-400f-80d1-2c13d9a47bfd",
"urn:mb_recording_id:4bea9dc0-11d3-4dc1-936b-73361da356eb",
"urn:spotify:track:0Om9WAB5RS09L80DyOfTNa",
"urn:youtube:GkD20ajVxnY"
],
"external-identifier-match-date": [
"acoustid:2018-12-17T12:25:12Z",
"mb_recording_id:2018-09-13T11:48:54Z",
"spotify:2018-08-22T17:20:06Z",
"youtube:2018-07-02T03:51:23Z"
]
},

[codecov]

Codecov Report

Merging #14 (5f4c2e6) into main (14573ed) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   75.54%   75.54%           
=======================================
  Files          20       20           
  Lines        1325     1325           
  Branches       26       26           
=======================================
  Hits         1001     1001           
  Misses        322      322           
  Partials        2        2           

Impacted Files	Coverage Δ
src/models/file.ts	58.09% <100.00%> (ø)

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