fix(inlayHint): hl_mode = 'replace' for neovim

[kevinhwang91]

Problem: neovim/neovim#24152 The inlays are affected by the other highlight groups.
Solution: use replace value for hl_mode instead of combine.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.57%. Comparing base (1a8244e) to head (2ad01b0).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4949   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files         273      273           
  Lines       26077    26077           
  Branches     5392     5392           
=======================================
+ Hits        25705    25706    +1     
+ Misses        219      217    -2     
- Partials      153      154    +1     

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[fannheyward]

From :h nvim_buf_set_extmark, the hl_mode's default value is replace, did I misunderstand it?

coc.nvim uses combine as default value

coc.nvim/autoload/coc/vtext.vim

Line 49 in 1a8244e

let opts = { 'hl_mode': get(a:opts, 'hl_mode', 'combine') }