create common utils for annotation methods

[dorien-er]

Changelog

• harmonize parameter use & names across annotation methods
• add common helper functions for model-based annotation methods
  • enable HVG subsetting
  • perform cross-checking of genes

Issue ticket number and link

Closes #xxxx (Replace xxxx with the GitHub issue number)

Checklist before requesting a review

• I have performed a self-review of my code

• Conforms to the Contributor's guide

• Check the correct box. Does this PR contain:

  • Breaking changes
  • New functionality
  • Major changes
  • Minor changes
  • Documentation
  • Bug fixes

• Proposed changes are described in the CHANGELOG.md

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