restrict dimensions to only those specified

[chessai]

Resolves #624

Before patch (specifying quantity and numeral, but time still shows up):

❯ curl -XPOST http://0.0.0.0:8000/parse --data 'locale=en_US&text="June 21 and 3 cups of sugar"&dims="[\"quantity\",\"numeral\"]"' | jq
[
  {
    "body": "June 21",
    "start": 1,
    "value": {
      "values": [
        {
          "value": "2021-06-21T00:00:00.000-07:00",
          "grain": "day",
          "type": "value"
        },
        {
          "value": "2022-06-21T00:00:00.000-07:00",
          "grain": "day",
          "type": "value"
        },
        {
          "value": "2023-06-21T00:00:00.000-07:00",
          "grain": "day",
          "type": "value"
        }
      ],
      "value": "2021-06-21T00:00:00.000-07:00",
      "grain": "day",
      "type": "value"
    },
    "end": 8,
    "dim": "time",
    "latent": false
  },
  {
    "body": "3 cups of sugar",
    "start": 13,
    "value": {
      "value": 3,
      "type": "value",
      "product": "sugar",
      "unit": "cup"
    },
    "end": 28,
    "dim": "quantity",
    "latent": false
  }
]

After patch (time no longer shows up):

❯ curl -XPOST http://0.0.0.0:8000/parse --data 'locale=en_US&text="June 21 and 3 cups of sugar"&dims="[\"quantity\",\"numeral\"]"' | jq
[
  {
    "body": "3 cups of sugar",
    "start": 13,
    "value": {
      "value": 3,
      "type": "value",
      "product": "sugar",
      "unit": "cup"
    },
    "end": 28,
    "dim": "quantity",
    "latent": false
  }
]

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@chessai merged this pull request in 99e1dce.