Add VSCode Codicons

[nickspurry]

This PR adds VSCode Codicons to the set of supported icons. Codicons are given a prefix of "Vsc" to match React-Icons. Icons are gated behind a new "Codicons" feature.

This PR also sets a default SVG viewbox size of "0 0 16 16" in codegen for icons that don't include an SVG viewbox element. At least a couple of the upstream Codicons do not contain a viewbox element, which previously caused codegen to panic.

[Copilot]

Pull Request Overview

This PR adds support for VSCode Codicons by introducing a new icon feature and updating the code generation to provide a default SVG viewbox.

• Introduces a new module (vsc_icons) gated behind the "codicons" feature.
• Adds a Cargo.toml dependency for codicons.
• Updates codegen to generate Codicons using a default viewbox for missing SVG attributes.
• Updates README.md to document the new Codicons feature.

Reviewed Changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/lib/src/icons.rs	Adds module for VSCode Codicons gated by the "codicons" feature
packages/lib/Cargo.toml	Registers the codicons dependency
packages/codegen/src/main.rs	Introduces code generation for Codicons using a new icon prefix "Vsc"
packages/codegen/src/create_icon_file.rs	Updates SVG attribute extraction with a default viewbox
README.md	Documents the new Codicons feature and adds a link to its official site

Files not reviewed (2)

• .gitmodules: Language not supported
• icon_resources/vscode-codicons: Language not supported

Comments suppressed due to low confidence (1)

README.md:24

• The link path uses 'vs_icons' which is inconsistent with the module name 'vsc_icons'. Consider updating the documentation to align with the code.

- [codicons](https://docs.rs/dioxus-free-icons/latest/dioxus_free_icons/icons/vs_icons/index.html)

[nissy-dev]

LGTM！Thanks!