Use separated deno.json to manage dependencies

[lambdalisue]

Require vim-denops/denops.vim#446

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.81%. Comparing base (abfe3b7) to head (f41fe54).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   83.84%   83.81%   -0.03%     
==========================================
  Files          32       32              
  Lines        2024     2021       -3     
  Branches      214      214              
==========================================
- Hits         1697     1694       -3     
  Misses        324      324              
  Partials        3        3              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.