:+1: RPC request directly from lua to avoid conversion with Vim script

[uga-rosa]

SSIA Conversion may affect performance.

Test

• denops/rc/main.ts

  
  import { Denops } from "https://deno.land/x/denops_std@v5.2.0/mod.ts";

export function main(denops: Denops) { denops.dispatcher = { nochange(x: unknown): unknown { return x; }, }; }

- time.lua
```lua
local x = vim.lsp.protocol.make_client_capabilities()

-- vim.fn['denops#request']()
local start = vim.fn.reltime()
for _ = 1, 1000 do
  _ = vim.fn["denops#request"]("rc", "nochange", { x })
end
print(("vim.fn['denops#request'](): %.4f s"):format(vim.fn.reltimefloat(vim.fn.reltime(start))))

-- require('denops').request()
start = vim.fn.reltime()
for _ = 1, 1000 do
  _ = require("denops").request("rc", "nochange", { x })
end
print(("require('denops').request(): %.4f s"):format(vim.fn.reltimefloat(vim.fn.reltime(start))))

• Source time.lua.

source %

• Result

  vim.fn['denops#request'](): 0.5875 s
  require('denops').request(): 0.4746 s

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.75%. Comparing base (4f0bbc9) to head (43481fc). Report is 97 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #308 +/- ## ========================================== - Coverage 96.47% 90.75% -5.72% ========================================== Files 3 12 +9 Lines 85 746 +661 Branches 6 68 +62 ========================================== + Hits 82 677 +595 - Misses 3 69 +66 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[lambdalisue]

The cost of adding a Lua implementation is somewhat high, but I believe it's sufficient to establish a method for accessing the raw channel. I've opened a new issue regarding this in Denops v6.1 (https://github.com/vim-denops/denops.vim/issues/309).

[lambdalisue]

Rethink about this and I've changed my mind. Now I think exposing the raw channel would make things more complicated than adding lua implementation.