Hover information

[wkillerud]

This feature enables the Hover request.

The hover information is mostly used to show documentation, such as for CSS properties and Sass modules. Other examples are:

• Selector specificity
• SassDoc
• Information about Sass symbol declaration (location, value)

Implementation

• CSS hover
• Sass hover

Tests

• https://github.com/wkillerud/some-sass/blob/main/packages/vscode-css-languageservice/src/test/css/hover.test.ts
• https://github.com/wkillerud/some-sass/blob/main/packages/language-services/src/features/__tests__/do-hover.test.ts
• https://github.com/wkillerud/some-sass/blob/main/vscode-extension/test/e2e/defaults-scss/hover.test.js

[wkillerud]

The data sources for hover information for web platform and Sass features were added in #4 and #5