Allow special characters for the facet range labels

[prmaxim]

Description

For numeric fields, you can provide a list of ranges and corresponding labels on which documents should be faceted.

Label naming is currently pretty strictly alphanumeric. However, there are uses where more special characters are needed. For example, for facets like this:

PRICE
-----
$0 - $19 (5)
$20 - $59 (11)
$60+ (4)

Steps to reproduce

{
  "facet_by": "price($0 - $19:[0, 20], $20 - $59:[20, 60], $60+:[60, ])"
}

or

{
  "facet_by": "price(`$0 - $19`:[0, 20], `$20 - $59`:[20, 60], `$60+`:[60, ])"
}

resulting in an error:

Facet range value is not valid.

Metadata

Typesense Version: 26