Universal save image function

[n4hm3]

[https://github.com//issues/1]

Description

Universal save function for saving different files types.
Metadata and writer params require bioio writer exploration. (standardise image function from [https://crick.atlassian.net/browse/AIOD-159] could be useful for this)

Changes

• Added save_image and resize_dim function
• Edited reduce_dtype based on feedback of wanting it to be based on a dtype param instead of bits param