[WIP] Use lua functions on neovim >= 0.6.0 for better performance

[chemzqm]

The lua functions could be much faster, could help to reduce the block on neovim.

[codecov[bot]]

Codecov Report

Merging #3621 (8427bdd) into master (122c248) will increase coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3621      +/-   ##
==========================================
+ Coverage   76.65%   76.66%   +0.01%     
==========================================
  Files         203      203              
  Lines       20194    20194              
  Branches     4509     4509              
==========================================
+ Hits        15479    15482       +3     
+ Misses       2934     2932       -2     
+ Partials     1781     1780       -1     

Impacted Files	Coverage Δ
src/model/task.ts	89.47% <0.00%> (-2.64%)	:arrow_down:
src/completion/index.ts	75.05% <0.00%> (-0.24%)	:arrow_down:
src/list/ui.ts	91.92% <0.00%> (+0.31%)	:arrow_up:
src/core/documents.ts	89.23% <0.00%> (+0.61%)	:arrow_up:
src/model/status.ts	92.85% <0.00%> (+4.76%)	:arrow_up:

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[kevinhwang91]

Improved a lot compare with Vimscript in a large file.

Call Lua from Typescript directly should be better performance.

let curr = await this.nvim.lua(`return require('coc').getHighlights(...)`, [bufnr, ns]) as HighlightItemResult[]

Waiting for this PR to be merged.