Make depmap annotation optional

[cansavvy]

Description

I've turned the cn_annotate argument into depmap_annotate which makes all of the annotation optional. Its mainly just used for plots. So we don't want people to have to use it if they are using a cell line for example that is not included in DepMap.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Need to see if this works in unit testing.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules