feat(api): add useQuery, useMutation, useGet composables

[brc-dd]

closes #398

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[brc-dd]

do we have use cases where we want to mutate loading or data from outside the composable? like maybe to reset or something?

[kiaking]

@brc-dd
For loading, I think we never had that use case, but data might. Like, when we want to do optimistic update 👀 I think I have done something like this in the past.

// Get single user.
const { data: user } = useQery(() => /* ... */)

const { execute: updateUser } = useMutation(() => /* ... */)

function updateUser(newUser) {
  // Update user directly since we don't need to re-fetch.
  user.value = newUser

  updateUser(/* ... */)
}

[brc-dd]

ok updated

[kiaking]

Added the docs! Please feel free to merge it when ever you feel like it 👍