Allow to read and write the stage XYZ center coordinates when reading and writing a CZI

[sebi06]

User Request: https://forum.image.sc/t/first-public-release-of-pylibczirw-and-cztile-packages/65517/13?u=sebi06

The problem that might arise is the following:

• A user reads a CZI using pylibCZIrw --> the original stage coordinates are XYZ
• User does the processing
• User writes CZI without any stage coordinates --> Fallback will be ???
• New CZI is opened in ZEN and the stage tools gets activated
• User "clicks" and the stage drives "somewhere" --> potential hardware crashes

General Considerations:

• Reading the XYZ coordinates per 2D image plane should be very simple
• Writing must be also done per plane
• It is not responsibility of pylibCZIrw to make sure only meaningful XYZ stage coordinates are written
• Before any hardware will be move based on stage coordinates it is the responsibility of the application moving the hardware to check the validity of the entries

In order to avoid those issues the user must have at least the option to read the original XYZ stage center and also to write it to the new CZI file.