Add support language `pythondata` for `30 Days of Pandas` problem set

[cyinc]

🚀 Feature Proposal

Using the default language python3 to pull Pandas problem (e.g. LeetCode 1148) will get error:

[ERROR] Not supported language "python3"
[WARN] Supported languages:  mssql   mysql   oraclesql   postgresql   pythondata 
(node:2829) Warning: Accessing non-existent property 'padLevels' of module exports inside circular dependency

Motivation

To support Pandas problem set

Contribution

Potential solution:

1. Step 1. Update package.json to support pythondata as default language type in configuration key leetcode.defaultLanguage: https://github.com/LeetCode-OpenSource/vscode-leetcode/blob/586b3e45fe0af299775436f2e8ea2a6ed5cdb8c6/package.json#L302
   • Similar to PR #412 :
2. Step 2. Anything else? e.g. problem template, submit process, request template?