[Help wanted][Enhancement] Refactor condition matchers

[hezean]

server-sdk-java/src/main/java/com/featureprobe/sdk/server/model/Condition.java

Lines 25 to 33 in 8c71ba4

	private static final Map<PredicateType, StringMatcher> stringMatchers = new EnumMap<>(PredicateType.class);
	private static final Map<PredicateType, SegmentMatcher> segmentMatchers = new EnumMap<>(PredicateType.class);
	private static final Map<PredicateType, DatetimeMatcher> datetimeMatchers = new EnumMap<>(PredicateType.class);
	private static final Map<PredicateType, NumberMatcher> numberMatchers = new EnumMap<>(PredicateType.class);
	private static final Map<PredicateType, SemverMatcher> semverMatchers = new EnumMap<>(PredicateType.class);

using map for predicate matching isn't a good practice, consider using strategy pattern or so.