feat(core): make observers on Query a public property

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **query** | ⬜️ Ignored ([Inspect](https://vercel.com/tanstack/query/AddpmzhYesyBCRfS1QrvPWnVHaHc)) | [Visit Preview](https://query-git-feature-public-observers-tanstack.vercel.app) | | Apr 23, 2024 7:10am |

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@tanstack/query-example-angular-basic	Configuration
@tanstack/query-example-react-basic-typescript	Configuration
@tanstack/query-example-solid-basic-typescript	Configuration
@tanstack/query-example-svelte-basic	Configuration
@tanstack/query-example-vue-basic	Configuration