feat(dashboard): variable management for all editor fields

[scopsy]

What changed? Why was the change needed?

• Add support for variables pill in the FieldEditor component
• Replace all existing body and subject to use the field editor
• Introduce a variable popover
• Allow managing liquid syntax in a visual way
• Reordering liquid filters and managing filter params

Screenshots

https://www.loom.com/share/cd1ec264b44249f88770d1ffe0d37727

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[scopsy]

@SokratisVidros I've improved some useMemo usecases, but other than that I couldn't notice any significant degradation compared to staging or prod. Let me know if you have some specific scenarios we might want to optimize.