Add analogue of Functions as Effects like swirl

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  Description

  This PR adds a new analogue of Functions as Effects called "swirl" to the Flipbook-Language repository. The swirl effect applies a rotation transformation to each page of the flipbook, with the angle of rotation increasing for each subsequent page.

Summary of Changes

• Added a new function named SwirlEffect in the evaluator.go file.
• The SwirlEffect function takes as input the flipbook pages and a parameter for the rate of rotation.
• The SwirlEffect function applies a rotation transformation to each page, with the angle of rotation calculated as the current page number multiplied by the rate of rotation.
• Updated the flipbook language interpreter in the evaluator to recognize the swirl effect command and call the SwirlEffect function with the appropriate parameters.
• Updated the pdf generator in the evaluator to apply the transformations specified by the effects, including the swirl effect, to the flipbook pages.

Fixes #2.

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Rollback Files For Sweep

• [ ] Rollback changes to evaluator/evaluator.go
• [ ] Rollback changes to evaluator/evaluator.go
• [ ] Rollback changes to evaluator/evaluator.go
• [ ] Rollback changes to evaluator/evaluator.go
• [ ] Rollback changes to evaluator/evaluator.go
• [ ] Rollback changes to evaluator/evaluator.go

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• [ ] Apply: Leftover TODOs in the code should be handled.
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