feat(apps/gql): handle upvote mutations better & add PanoPost.isUpvotedByViewer resolver

[usirin]

Adds a new simple wrapper around DataLoader so apps don't use it directly, which gives us a solid extension for the future.

Used this loader, it's not optimized by us, because we delegate it to prisma's own dataloader abstaction by using prisma.upvote.findUnique: https://www.prisma.io/docs/guides/performance-and-optimization/query-optimization-performance#solving-n1-in-graphql-with-findunique-and-prismas-dataloader

Checklist

• discord username: umut
• Closes feat(gql): add PanoPost.isUpvotedByViewer field #621
• Closes feat(gql-utils): add support for multiple query identifiers #623
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How were these changes tested?

Please describe the tests you did to test the changes you made. Please also specify your test configuration.

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[alicangunduz]

💯

[rasitds]

💯 lets goooooooooooooooooooo

[usirin]

@sevilayerkan let's add a test for this loader and cover this case, we can use prisma/create-loader-test.test.ts as an example

monorepo/packages/gql-utils/prisma/create-loader.test.ts

Lines 33 to 45 in 566babc

	it("accepts an onComplete handler after prisma fetch is done", async () => {
	mockedPrisma.user.findMany.mockResolvedValueOnce([
	mockUser({ id: "1" }),
	mockUser({ id: "2" }),
	]);
	const onComplete = vi.fn();
	const byID = createPrismaLoader(mockedPrisma.user, "id", onComplete);
	const result = await Promise.all([byID.load("1"), byID.load("2")]);
	expect(onComplete).toHaveBeenCalledWith(result);
	});