Bring Explorer and CodeMirror in sync again

[hasparus]

Problem: Explorer tree and CodeMirror editor are currently out of sync.

I created this bug (mea culpa), when I moved the querySource state down in #15, because rerendering the whole thing on every keystroke resulted in the cursor jumping to the beginning of the text if you pressed backspace/delete fast multiple times.

We were already listening for queryEditor's "change" events in SavedQueriesToolbar, so I just gave the same treatment to the Explorer plugin.

(SavedQueriesToolbar is the top bar we use in Subgraph Studio and Graph Explorer so people can see example queries premade by Subgraph authors.)

The bug is solved, but we end up with a little bit more code, because I inlined @graphiql/plugin-explorer to do this.

@B2o5T Could you tell me if I'm being silly here? Is reading queryEditor from context and listening to query source sth worthwhile contributing upstream to @graphiql/plugin-explorer?

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[github-actions]

📊 Package size report   3%↑

File	Before (Gzip)	After (Gzip)
dist/index.cjs	6.0 kB	16%↑7.0 kB
dist/index.d.ts	653 B	-3.22%↓632 B
dist/index.mjs	7.2 kB	20%↑8.7 kB
dist/plugins/explorer/useExplorerPlugin.d.ts	—	200 B
dist/style.css	82.9 kB	0.2%↑83.1 kB
dist/useQuerySource.d.ts	—	70 B
package.json	869 B	-0.69%↓863 B
Total (Includes all files)	103.8 kB	3%↑106.5 kB
Tarball size	102.7 kB	2%↑104.9 kB

Unchanged files

File	Size (Gzip)
dist/GraphiQLInterface.d.ts	1.3 kB
dist/SavedQueriesToolbar/ActionsMenu.d.ts	267 B
dist/SavedQueriesToolbar/DefaultQueryChip.d.ts	171 B
dist/SavedQueriesToolbar/index.d.ts	92 B
dist/SavedQueriesToolbar/messages.d.ts	316 B
dist/SavedQueriesToolbar/queryInSearchParams.d.ts	117 B
dist/SavedQueriesToolbar/SavedQueriesActionButtons.d.ts	451 B
dist/SavedQueriesToolbar/SavedQueriesContext.d.ts	281 B
dist/SavedQueriesToolbar/savedQueriesReducer.d.ts	317 B
dist/SavedQueriesToolbar/SavedQueriesToolbar.d.ts	459 B
dist/SavedQueriesToolbar/SavedQuerySelect.d.ts	272 B
dist/SavedQueriesToolbar/styles.d.ts	117 B
dist/SavedQueriesToolbar/types.d.ts	109 B
dist/SavedQueriesToolbar/validation.d.ts	303 B
dist/validations.d.ts	156 B
LICENSE	647 B
README.md	755 B

_{🤖 This report was automatically generated by pkg-size-action}