Use vitest for tests

[tstirrat15]

Fixes #171

Description

A QOL thing. Vitest is the current state-of-the-art and supports typescript out of the box without the need for manual transpilation. It also is quite fast and supports concurrency and parallelization nicely.

Changes

• Get rid of jasmine and its deps
• Add vitest
• Rework test files to use vitest imports and wrap callback-based test definitions in promises per https://vitest.dev/guide/migration.html#done-callback

Testing

Review. See that things are green.