Refactor/improvements in helpers

[saleel]

Description

• Fix multiple DKIM edge cases
• Add option to generate inputs from raw eml
• Add tests for DKIM sanitizations, input helpers
• Rename files and functions to keep be uniform
• Remove unused code

Note: This is based to feat/circuit-refactor which is based to v4. Major version v4 can be released after both PRs are merged and docs are updated.

Type of Change

Please delete options that are not relevant.

• 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

Checklist:

• I have discussed with the team prior to submitting this PR
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

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🚮 Removed packages: npm/@types/lodash@4.14.195

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