Vihaan anant/ calendar functionality

[anantduggal]

Notion ticket link

Calendar Absence Creation and Deletion

Implementation description

• Added Calendar Functionality -> creating and deleting events on a calendar
• Multiple events are allowed.
• Managed buttons instead of onclick events
• Stored in dynamic memory

Steps to test

1. Multiple Added Events shows up on the specified date
2. All events are able to be deleted with a "delete" button right under it

What should reviewers focus on?

• Calendar & Input form are being held in dynamic memory, to avoid hydration UI issues.

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[ChinemeremChigbo]

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