Add employee search bar

[Enochen]

Summary

This adopts the search bar from the students page.

It searches firstName, lastName, email, phoneNumber, vehicle.name, and roles if applicable (sds-admin or redrunner-admin only)

Test Plan

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[dti-github-bot]

[diff-counting] Significant lines: 86.

[pratyush1712]

The changes look very good. I liked the usage of useMemo hook to optimize searching and using a common component in both employees and students page

[kevin-lin12]

Looks great! I love how you kept the code style the same for the student search. Makes the code a lot easier to understand and read.

[SGupta101]

Good work Enoch! Tested on different browsers and works as expected.