Add Jest test database manager

[PatrickDinh]

No description provided.

[cuzzlor]

Would this be more reflective of real life and easier to understand at a glance to assign both the DataSource + dispose rather than just assigning the dispose function?

Suggested change

	```typescript
	```ts
	describe('example suite which uses isolated DB instance', () => {
	let dispose: AsyncDisposable
	let ds: DataSource
	beforeAll(async () => {
	const prepared = await testDbManager.prepareTestDatabaseSource()
	disposable = prepared.disposable
	dataSource = prepared.dataSource
	})
	afterAll(async () => {
	await dataSource.[Symbol.asyncDispose]()
	await dispose.[Symbol.asyncDispose]()
	})
	})

[cuzzlor]

There are some new types in Typescript 5.2 for Disposable and AsyncDisposable which might be worth using?

https://www.typescriptlang.org/docs/handbook/release-notes/typescript-5-2.html#libdts-changes

The TestDatabaseManager could implement AsyncDisposable to await its list of cleanup tasks.. This hopefully may make things easier in the future, e.g. if the runtimes handle this on our behalf we might need less before and after.

[PatrickDinh]

Hi @cuzzlor, thanks for the suggestion, today I learnt about AsyncDisposable interface.

I tried to implement it in this library but faced an issue:

• AsyncDisposable requires the resource to be declared with using. I can't find any resources on how to fit using into Jest setup and teardown.

Do you know a way to address it?

[cuzzlor]

Can you just create it in the test setup and call async dispose in the test teardown without using a using ?

Feel free to ignore my suggestions, I was thinking it might be useful to explore the layout of the new disposable features and align towards if it's not too clunky.