Milestone

• When clicking the problem node, create a webview panel with problem description.
  This feature could be implemented with leetcode-cli show -x command. Would be better if we can keep the color of console output. Add Click the tree explorer should open the topic (#132) #186

• Add/Remove favorite problem from right-click context menu.
  Could be implemented by leetcode-cli star command.

• Show most voted solution in a webview panel from right-click context menu.
  Could be implemented by leetcode-cli show <id> --solution command from solution.dicuss plugin. Top voted solution webview #193

• Open problem page in web browser from right-click context menu.

• Intellisense, lint, debug with testcase locally.
  Relative work: leetcode-cli test <filename> --local command from cpp.run plugin.
  Intellisense and lint service could be provided by other extensions like cpptool. What we should do is to provide some pre-included headers/packages like bits/stdc++.h and some ListNode definitions, which has been covered by the effort of cpp.run plugin.