fix: custom query and mutation arguments passing

[bartoszherba]

closing: https://alokai.atlassian.net/browse/ES-373

[FIXED] Correctly passing properties and options to customQuery and customMutation SDK methods. Previously, the customHeaders option was not being passed properly. Now, all options will be properly passed to the customQuery and customMutation methods.

🔗 Linked issue

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme or JSDoc annotations)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

• [ ] I have linked an issue or discussion.
• [ ] I have updated the documentation accordingly.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 50a78becf4abc913d0ebf855303f03ab4f8750c7

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

This PR includes changesets to release 1 package

| Name | Type | | --------------------------- | ----- | | @vue-storefront/magento-sdk | Patch |

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