[FEATURE]: Support new DataType: Array

[xiaocai2333]

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Anything else?

Support Array DataType for milvus.

1. There is an element_type field to represent the type of the actual element.
2. There is an upper limit on the number of elements max_capacity. If element type is VARCHAR, it must contain max_length.
   pymilvus example:

pk_field = FieldSchema(name="id", dtype=DataType.INT64, is_primary=True, auto_id=False)
int_array_field = FieldSchema(name="int_array", dtype=DataType.ARRAY, element_type=DataType.INT64, max_capacity=100)
str_array_field = FieldSchema(name="string_array", dtype=DataType.ARRAY, element_type=DataType.VARCHAR,
                              max_capacity=100, max_length=100)
float_vector = FieldSchema(name="float_vector", dtype=DataType.FLOAT_VECTOR, dim=dim)
schema = CollectionSchema(fields=[pk_field, int_array_field, str_array_field, float_vector],
                          enable_dynamic_field=True)

[xiaocai2333]

/assign @xiaocai2333