vscode: implement proposed `shareProvider` API

Description

Contributor guide

Tech stack

typescript

Domain

apideveloper experience

Issue type

feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

4

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

3-5 days

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

fresh

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

clear

Prerequisites

TypeScriptVS Code APITheia framework

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

35

Research direction

First, study the proposed shareProvider API definition at the linked VS Code source. Then, explore how Theia implements similar VS Code APIs by looking at existing proposed API implementations in the repository, such as those in `packages/` directories. Check the issue comments for any additional context or guidance from maintainers. Finally, implement the API following Theia's extension system patterns, ensuring compatibility with the existing architecture.