function osmIsInterestingTag(key) {
    if (uninterestingKeys.has(key)) return false;
    if (uninterestingKeyRegex.test(key))  return false;
    return true;
}
Returns whether the given OSM tag key is potentially "interesting".
For example, some tags are deemed not interesting because the respective tag is
considered "discardable".

@param {string} key the key to test
@returns {boolean}