Refactor SDSFilter for readability

[MartinWheelerMT]

What

• Refactor into seperate methods for easier readability.
• Refactor prepareLookupUri to use regex matching for readability.

Why

For readabilty.

Type of Change

Please check the option(s) that apply.

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Internal change (non-breaking change with no effect on functionality affecting end users)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have performed a self-review of my code
• 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
• I have updated the Changelog with details of my change in the UNRELEASED section, if this change will affect end users

[github-actions]

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