feat(lsp): improve json deserialization performance (#15854)

* Add optional second table argument to vim.json.decode which takes
  a table 'luanil' which can include the 'object' and/or 'array' keys. These
  options use luanil when converting NULL in json objects and arrays
  respectively. The default behavior matches the original lua-cjson.
* Remove recursive_convert_NIL function from rpc.lua, use
  vim.json.decode with luanil = { object = true } instead. This removes a hotpath
  in the json deserialization pipeline by dropping keys with json NULL
  values throughout the deserialized table.

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