Byte array converter + converters cleanup

[roimenashe]

1. Byte arrays should not be converted or waste time on unnecessary convert collection flow (read flow only, write flow treat Byte arrays as simple fields).
2. Aerospike converters cleanup, remove unnecessary/unused converters.

[reugn]

We may need to add the same check to the MappingAerospikeWriteConverter.

[roimenashe]

We may need to add the same check to the MappingAerospikeWriteConverter.

@reugn
Byte[] fields are written directly (without conversions), method MappingAerospikeWriteConverter.getValueToWrite() checks whether the field value is a simple value in line 128 - conversions.isSimpleType(value.getClass())) is true.

Also test MappingAerospikeConverterTypesTest.ObjectWithByteArrayFieldWithOneValueInData() covers write and read of byte[] fields.

[Aloren]

Please prepare a test where:

1. you write data using document:

class Doc {
byte[] array;
}

2. you read data using document:

class Doc {
List<Byte> array;
}

Existing implementation should not fail, but introduced change will fail with exception. This is because you need to check not only for source, but also for target type.

[Aloren]

So for performance improvement you need to have the same logic for arrays as with collections:
https://github.com/aerospike-community/spring-data-aerospike/blob/f12909f642ac9f2f7e7bb9eebbb2aded8897d6f7/src/main/java/org/springframework/data/aerospike/convert/MappingAerospikeReadConverter.java#L191

[roimenashe]

@Aloren
Added a check for the target type - convert as it is only in case the source is byte[] and the target type is also byte[] ("[B") otherwise convert as collection.
Also added the tests that you suggested.