feature: Add support for selecting problem of today.

[billchen2k]

Now you can select problem of today from the navigation section of the LeetCode page. Support CN and EN endpoints.

This feature used my updated version of vsc-leetcode-cli, which added -d argument to the show command to make it possible to fetch problem of today. The merge request is stated here: https://github.com/leetcode-tools/leetcode-cli/pull/60 . You might need to merge that MR first and update the NPM repository and change the vsc-leetcode-cli version here.

[runningzyp]

同意,非常期待的功能