🐛 Use msgpack-rpc client type on Neovim

[lambdalisue]

Close #268

neovim/neovim#24399

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (bfdc079) 92.59% compared to head (fe3235a) 92.59%.

❗ Current head fe3235a differs from pull request most recent head 987e84d. Consider uploading reports for the commit 987e84d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #271   +/-   ##
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  Coverage   92.59%   92.59%           
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  Files           3        3           
  Lines          81       81           
  Branches        6        6           
=======================================
  Hits           75       75           
  Misses          6        6           

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[lambdalisue]

Prior to neovim/neovim#24399, Neovim does not have msgpack-rpc client type but client type was not actually refered so we can simply merge this. (it should works well on previous Neovim as well)