chore: install vitest

[jonghyo]

install vitest instead of jest.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	83.97%	587 / 699
🔵	Statements	83.97%	587 / 699
🔵	Functions	93.33%	28 / 30
🔵	Branches	90.39%	160 / 177

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
vitest.config.ts	0%	0%	0%	0%	1-49

Generated in workflow #34 for commit 0cfb014 by the Vitest Coverage Report Action