Update name to Sourcemeta JSON Schema Studio and add note in readme about verification

[Karan-Palan]

fix #143

Regarding discoverability on VS-code marketplace

• updated cli version to latest
• updated extension version to 1.0.0
• added better categories
• updated readme with note about verification
• updated extension name to Sourcemeta JSON Schema Studio

[augmentcode]

🤖 Augment PR Summary

Summary: Renames the VS Code extension and related branding to "Sourcemeta JSON Schema Studio" (fixes #143).
Changes:

• Updated extension/package identifiers, command/config keys, diagnostics labels, and UI titles to the new name.
• Adjusted CI/CD + Makefile packaging/publishing to use the renamed VSIX artifact.
• Refreshed README installation instructions and added a note about Marketplace publisher verification status.

Technical Notes: Bumps @sourcemeta/jsonschema from ^13.3.0 to ^13.6.0 in the VS Code extension.

_{🤖 Was this summary useful? React with 👍 or 👎}

[augmentcode]

Review completed. 2 suggestions posted.

Comment augment review to trigger a new review at any time.

[jviotti]

Let's not change the extension ID, as otherwise we would have to publish as a new extension. Just use the "JSON Schema" part on the display name, which we can update as we wish