refactor(types): make queryKey required on ObserverOptions

[TkDodo]

we cannot create an observer without a key, because an observer, per definition, watches a certain query by its key

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Sandbox	Source
@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

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Codecov Report

Merging #6879 (fdf7e75) into main (841b4f3) will decrease coverage by 0.04%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6879      +/-   ##
==========================================
- Coverage   41.82%   41.78%   -0.04%     
==========================================
  Files         178      178              
  Lines        7017     7014       -3     
  Branches     1418     1416       -2     
==========================================
- Hits         2935     2931       -4     
- Misses       3720     3721       +1     
  Partials      362      362              

Components	Coverage Δ
@tanstack/angular-query-devtools-experimental	∅ <ø> (∅)
@tanstack/angular-query-experimental	81.75% <ø> (ø)
@tanstack/eslint-plugin-query	85.11% <ø> (ø)
@tanstack/query-async-storage-persister	48.43% <ø> (ø)
@tanstack/query-broadcast-client-experimental	∅ <ø> (∅)
@tanstack/query-codemods	0.00% <ø> (ø)
@tanstack/query-core	93.62% <100.00%> (-0.08%)	⬇️
@tanstack/query-devtools	4.46% <ø> (ø)
@tanstack/query-persist-client-core	57.73% <ø> (ø)
@tanstack/query-sync-storage-persister	82.50% <ø> (ø)
@tanstack/react-query	93.07% <ø> (ø)
@tanstack/react-query-devtools	0.00% <ø> (ø)
@tanstack/react-query-next-experimental	∅ <ø> (∅)
@tanstack/react-query-persist-client	100.00% <ø> (ø)
@tanstack/solid-query	84.84% <ø> (ø)
@tanstack/solid-query-devtools	∅ <ø> (∅)
@tanstack/solid-query-persist-client	100.00% <ø> (ø)
@tanstack/svelte-query	62.68% <ø> (ø)
@tanstack/svelte-query-devtools	∅ <ø> (∅)
@tanstack/svelte-query-persist-client	100.00% <ø> (ø)
@tanstack/vue-query	70.81% <100.00%> (ø)
@tanstack/vue-query-devtools	∅ <ø> (∅)