Crash on query with predicate using long attributes.

[matsunanaro]

Describe the bug
Crash on query with predicate using long attributes.

Our app was making a query for a time period represented by two int64/long attributes in Unix Epoch Time, i.e milliseconds since 1970 Jan 1. However, it crashed with the following stack:

I/flutter (11304): onChange -- cubit: GlucoseQueryBloc, change: Change { currentState: GlucoseQueryLoading(), nextState: GlucoseQueryFailure: Failed to query database: Error querying Couchbase repository: CouchBaseRepositoryException: Error querying Couchbase repository: PlatformException(error, java.lang.Long cannot be cast to java.lang.Integer, null, java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
I/flutter (11304): 	at com.saltechsystems.couchbase_lite.QueryJson.inflateExpressionFromArray(QueryJson.java:361)
I/flutter (11304): 	at com.saltechsystems.couchbase_lite.QueryJson.inflateExpressionFromArray(QueryJson.java:528)
I/flutter (11304): 	at com.saltechsystems.couchbase_lite.QueryJson.inflateExpressionFromArray(QueryJson.java:519)
I/flutter (11304): 	at com.saltechsystems.couchbase_lite.QueryJson.inflateWhere(QueryJson.java:321)
I/flutter (11304): 	at com.saltechsystems.couchbase_lite.QueryJson.toCouchbaseQuery(QueryJson.java:114)
I/flutter (11304): 	at com.saltechsystems.couchbase_lite.CouchbaseLitePlugin$JSONCallHandler.onMethodCall(CouchbaseLitePlugin.java:708)
I/flutter (11304): 	at io.flutter.plugin.common.MethodCha

To Reproduce
Simply make a query with a long attribute in its predicate

Expected behavior
It seems that the code couldn't handle long on Android. However, it was working fine with iOS implementation.

Smartphone

• Device: Pixel 2 API 29 android-x86 simulator
• OS: Android 10

Additional context
According to the official document from Flutter here, a Long object is used in Java when its representation in Dart is an integer with > 32 bits.