Update route range interval and add docs

Author: mpgxvii

kafka-connect-fitbit-source/src/main/java/org/radarbase/connect/rest/fitbit/route/FitbitBreathingRateRoute.java

@@ -31,7 +31,6 @@
 
 public class FitbitBreathingRateRoute extends FitbitPollingRoute {
   private final FitbitBreathingRateAvroConverter converter;
-  protected static final Duration REQUEST_INTERVAL = Duration.ofDays(30);
 
   public FitbitBreathingRateRoute(FitbitRequestGenerator generator,
                                   UserRepository userRepository, AvroData avroData) {
@@ -50,9 +49,10 @@ protected Stream<FitbitRestRequest> createRequests(User user) {
             user.getExternalUserId(), DATE_FORMAT.format(dateRange.start())));
   }
 
+    /** Limit range to 30 days as documented here: https://dev.fitbit.com/build/reference/web-api/intraday/get-br-intraday-by-interval/ */
   @Override
   Duration getDateRangeInterval() {
-    return REQUEST_INTERVAL;
+    return THIRTY_DAYS;
   }
 
   @Override

kafka-connect-fitbit-source/src/main/java/org/radarbase/connect/rest/fitbit/route/FitbitIntradayHeartRateVariabilityRoute.java

@@ -32,7 +32,6 @@
 
 public class FitbitIntradayHeartRateVariabilityRoute extends FitbitPollingRoute {
   private final FitbitIntradayHeartRateVariabilityAvroConverter converter;
-  protected static final Duration REQUEST_INTERVAL = Duration.ofDays(30);
 
   public FitbitIntradayHeartRateVariabilityRoute(FitbitRequestGenerator generator,
       UserRepository userRepository, AvroData avroData) {
@@ -51,9 +50,10 @@ protected Stream<FitbitRestRequest> createRequests(User user) {
             user.getExternalUserId(), DATE_FORMAT.format(dateRange.start())));
   }
 
+  /** Limit range to 30 days as documented here: https://dev.fitbit.com/build/reference/web-api/intraday/get-hrv-intraday-by-interval/ */
   @Override
   Duration getDateRangeInterval() {
-    return REQUEST_INTERVAL;
+    return THIRTY_DAYS;
   }
 
   @Override

kafka-connect-fitbit-source/src/main/java/org/radarbase/connect/rest/fitbit/route/FitbitPollingRoute.java

@@ -95,6 +95,7 @@ public abstract class FitbitPollingRoute implements PollingRequestRoute {
   protected static final Duration LOOKBACK_TIME = Duration.ofDays(1); // 1 day
   protected static final long HISTORICAL_TIME_DAYS = 14L;
   protected static final Duration ONE_DAY = DAYS.getDuration();
+  protected static final Duration THIRTY_DAYS = Duration.ofDays(30);
   protected static final Duration ONE_NANO = NANOS.getDuration();
   protected static final TemporalAmount ONE_SECOND = SECONDS.getDuration();
   protected static final TemporalAmount ONE_MINUTE = MINUTES.getDuration();

kafka-connect-fitbit-source/src/main/java/org/radarbase/connect/rest/fitbit/route/FitbitSkinTemperatureRoute.java

@@ -31,7 +31,6 @@
 
 public class FitbitSkinTemperatureRoute extends FitbitPollingRoute {
   private final FitbitSkinTemperatureAvroConverter converter;
-  protected static final Duration REQUEST_INTERVAL = Duration.ofDays(30);
 
   public FitbitSkinTemperatureRoute(FitbitRequestGenerator generator,
                                     UserRepository userRepository, AvroData avroData) {
@@ -50,9 +49,10 @@ protected Stream<FitbitRestRequest> createRequests(User user) {
             user.getExternalUserId(), DATE_FORMAT.format(dateRange.start())));
   }
 
+  /** Limit range to 30 days as documented here: https://dev.fitbit.com/build/reference/web-api/temperature/get-temperature-skin-summary-by-interval */
   @Override
   Duration getDateRangeInterval() {
-    return REQUEST_INTERVAL;
+    return THIRTY_DAYS;
   }
 
   @Override