private static boolean isValidParam(String paramName) {
        return ALLOWED_MATCH_PARAMS.contains(paramName);
    }
Parses the client matching patterns and builds a map with entries that has
(PatternName, PatternValue) as the entries.
Ex: "VERSION=1.2.3" would be converted to a map entry of (Version, 1.2.3)
<p>
NOTES:
Client match pattern splits the input into two parts separated by first occurrence of the character '='

@param patterns List of client matching pattern strings
@return map of client matching pattern entries
server/src/main/java/org/apache/kafka/server/metrics/ClientMetricsConfigs.java