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Fix initialBindings failing when done over projected variables

Changes include:

- Fixed an issue with `FILTER(false)` not filtering all results out:
    - Changed the `FilterPushdown` optimizer to not push down `FILTER(false)` except if it is wrapped around another `FILTER`.
- Handle projected variables that also appear in `InitialBindings`.
    -  Make `MaterializeOperation` add a `VALUES` clause for these variables instead of replacing them with their values.
- Fix '$' variables in `VALUES`
    - Fix an issue where variables written with '$' instead of '?' within a `VALUES` clause weren't being parsed as variables.

Closes #1298

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