docarray: Initialization and construction of a `Document` and `DocumentArray` takes too long

Describe the bug Initialization and construction of a Document and DocumentArray takes a lot of time compared to simple list initialization:

from time import time 
n_docs = 1_000_000

# list initialisation
start_time = time()
numbers = [i for i in range(n_docs)]
duration = time() - start_time
print(f"duration list init = {duration}")

# DocumentArray initialisation
start_time = time()
numbers = DocumentArray[MyDoc]([MyDoc(number=i) for i in range(n_docs)])
duration = time() - start_time
print(f"duration da init = {duration}")

# construction of list of Documents
start_time = time()
numbers = [MyDoc.construct(number=i) for i in range(n_docs)]
duration = time() - start_time
print(f"duration list construct = {duration}")

# construction of DocumentArray of Documents
start_time = time()
numbers = DocumentArray[MyDoc]([MyDoc.construct(number=i) for i in range(n_docs)])
duration = time() - start_time
print(f"duration da construct = {duration}")

output:

duration list init         =  0.035775423049926 s
duration da init           = 11.883232831954956 s
duration list construct    = 10.953930139541626 s
duration da construct      =  9.914959907531738 s

Expected behavior Quicker.