function getRuleOptions(ruleConfig, defaultOptions) {
	if (Array.isArray(ruleConfig)) {
		return deepMergeArrays(defaultOptions, ruleConfig.slice(1));
	}
	return defaultOptions ?? [];
}
Get the options for a rule (not including severity), if any
@param {RuleConfig} ruleConfig rule configuration
@param {Object|undefined} defaultOptions rule.meta.defaultOptions
@returns {Array} of rule options, empty Array if none