Add `package.json` to package exports

[techniq]

Encountered after updating to the latest Svelte VSCode extension.

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './package.json' is not defined by "exports" in /Users/techniq/Documents/Development/carevoyance/code/apps/web/node_modules/prettier-plugin-svelte/package.json
    at new NodeError (node:internal/errors:387:5)
    at throwExportsNotFound (node:internal/modules/esm/resolve:464:9)
    at packageExportsResolve (node:internal/modules/esm/resolve:748:3)
    at resolveExports (node:internal/modules/cjs/loader:500:36)
    at Module._findPath (node:internal/modules/cjs/loader:540:31)
    at Module._resolveFilename (node:internal/modules/cjs/loader:996:27)
    at Function.resolve (node:internal/modules/cjs/helpers:108:19)
    at getPackageInfo (/Users/techniq/.vscode/extensions/svelte.svelte-vscode-107.9.0/node_modules/svelte-language-server/dist/src/importPackage.js:30:37)
    at SveltePlugin.formatDocument (/Users/techniq/.vscode/extensions/svelte.svelte-vscode-107.9.0/node_modules/svelte-language-server/dist/src/plugins/svelte/SveltePlugin.js:77:48)
    at async PluginHost.tryExecutePlugin (/Users/techniq/.vscode/extensions/svelte.svelte-vscode-107.9.0/node_modules/svelte-language-server/dist/src/plugins/PluginHost.js:342:20) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'

I have this monkey patched in my local node_modules/prettier-plugin-svelte/package.json and it fixes prettier svelte formatting within VSCode within my environment.

[dummdidumm]

Thank you!

[techniq]

@dummdidumm Welcome and thank you for the quick turnaround on the merge/release.