Handle documents outside workspace

[gediminasz]

Part of #68

[Copilot]

Pull request overview

This PR implements support for handling documents outside the workspace in the ctags-companion extension, specifically for the provideDocumentSymbols functionality. This addresses issue #68.

Key changes:

• Updated provideDocumentSymbols to use absolute file paths instead of relative paths and removed the workspace-specific working directory requirement
• Modified definitionToSymbolInformation to handle cases where no workspace scope is available
• Enhanced the VS Code mock to properly simulate getWorkspaceFolder behavior for documents outside the workspace

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/readtags.test.js	Added parameterized test cases to verify document symbols work for both documents inside and outside the workspace
src/readtags.js	Removed workspace-specific path handling and TODO/FIXME comments, now uses absolute paths and no longer requires a working directory
src/helpers.js	Updated definitionToSymbolInformation to accept undefined scope, changed default parameters from null to undefined, and added logic to handle paths when scope is not available
src/mocks/vscode.js	Updated getWorkspaceFolder mock to return undefined for URIs outside the workspace scope

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