fix: don't crash if schema cache directories already exist

[antitoxic]

👋 Hi there. Thank you for creating the library. It's super useful!

One problem I noticed happening in our GitHub CI process is that it crashed sometimes and the error was:

Error while loading rule 'json-schema-validator/no-invalid': EEXIST: file already exists, mkdir 'node_modules/eslint-plugin-json-schema-validator/.cached_schemastore'

Which was caused by fs.mkdirSync throwing an error when a directory already exists.

I swapped this with fs.mkdirSync('<path to dir>', { recursive: true }) which will not throw if the directory exists AND has the added benefit that it automatically creates any missing parent directory which means you don't need the makeDirs helper function.

[changeset-bot]

🦋 Changeset detected

Latest commit: 20ca574

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
eslint-plugin-json-schema-validator	Patch

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[ota-meshi]

LGTM! Thank you!