Add caching

[ad1992]

Add in-memory caching to optimize the perf and enhance the search results.

[ad1992]

@KemingHe let's move caching-related changes to a separate PR so it's easy to review and also have caching-specific tests to ensure better context separately.
It's always best to fix one issue per PR so it is easy to revisit later, maintain, and track as well :)

[KemingHe]

@ad1992 , ref d21b62b

@KemingHe let's move caching-related changes to a separate PR so it's easy to review and also have caching-specific tests to ensure better context separately.
It's always best to fix one issue per PR so it is easy to revisit later, maintain, and track as well :)

• testing implementation branch reset and fixed typo and updated snapshot, see test(__tests__ dir): added vitest and coverage reporting GitHub Actions workflow #8

[KemingHe]

Let us know your exact expectations of this task. Currently we only have one sentence to work with:

Add in-memory caching to optimize the perf and enhance the search results.

Before we begin. Thank you. 🌻