Import from arcticdb.util.test gives an error on Windows

[DrNickClarke]

Describe the bug

from arcticdb.util.test import random_strings_of_length

gives the error

`---------------------------------------------------------------------------
ModuleNotFoundError Traceback (most recent call last)
Cell In[8], line 6
4 import random
5 import arcticdb as adb
----> 6 from arcticdb.util.test import random_strings_of_length

File ~\Python\s3_tests\s3_tests\lib\site-packages\arcticdb\util\test.py:13
11 import numpy as np
12 import pandas as pd
---> 13 import pytest
14 import string
15 import random

ModuleNotFoundError: No module named 'pytest'
`

Steps/Code to Reproduce

see above. Reproduced using arcticdb v4.2.1 on Windows.

Expected Results

No error is thrown

OS, Python Version and ArcticDB Version

Pyton 3.10, Windows 11, arcticdb 4.2.1

Backend storage used

Does not need storage to repro

Additional Context

The root cause is the function param_test https://github.com/man-group/ArcticDB/blob/master/python/arcticdb/util/test.py#L131

This function is only used by unit tests so should be moved to the unit test area of the project. Then import pytest can be removed from the main package.

The usages are in this file

ArcticDB/python/tests/unit/arcticdb/version_store/test_normalization.py

Line 40 in 14b14b9

param_dict,

[jamesmunro]

I think this was solved by your commit @DrNickClarke.
#1350
Can we close?