Forking psyclone_tools in LFRic_Apps

### Are there any linked Issues or Pull Requests?

#663 - Umbrella Issue

### Brief description

As described in parent issue #663, we are looking to duplicate psyclone_tools from LFRic_Core into LFRic_Apps.

Linked to PR [726](https://github.com/MetOffice/lfric_apps/pull/726)

### Further details of the issue.

• Any scripts within LFRic_Apps, which use psyclone tools will be switched to using the LFRic_Apps version, therefore reducing dependencies across repositories.
• LFRic_Core’s psyclone_tools will be kept simple, with the tiling component of colouring moved to LFRic_Apps. Going forward the LFRic_apps version can be developed as a separate python library.
• User’s relying on psyclone_tools.py within lfric_core, who do not make use of LFRic_Apps, will be unaffected.

The specific location of psyclone_tools within LFRic_Apps is to be determined. An initial suggestion is lfric_apps/interfaces/build/.

Note: The dependency of LFRic_Apps on LFRic_Core is currently and should remain only one way. In no part of the duplication do we want Core to become dependent on material within Apps.