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 83.43%. Comparing base (e892695) to head (a465622).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   82.14%   83.43%   +1.28%     
==========================================
  Files          27       31       +4     
  Lines        1798     1974     +176     
  Branches      185      200      +15     
==========================================
+ Hits         1477     1647     +170     
- Misses        318      324       +6     
  Partials        3        3              

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