feat: add placeholder for schema-driven form UI in PluginEditorDrawer

[ManojMJ17]

…orDrawer

Please answer these questions before submitting a pull request, or your PR will get closed.

Why submit this pull request?

• Bugfix
• [x ] New feature provided
• Improve performance
• Backport patches

What changes will this PR take into?

This PR adds a placeholder button for a future schema-driven form UI in the PluginEditorDrawer.

It is a preparatory step towards improving plugin configuration UX by introducing a dynamic form system based on JSON Schema.

Related issues
N/A

fix/resolve #1

Checklist:

• [x ] Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• [ x] Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[ManojMJ17]

Hi, I’m interested in contributing to the SchemaForm feature for APISIX Dashboard.

This PR is a small preparatory step. Please let me know if any changes are needed.

[Baoyuantop]

Hi @ManojMJ17, thank you for your contribution. However, we recommend opening an issue to describe your proposal rather than submitting a pull request.