[Feature request]: ability to configure root_markers for lsp

[ashish16052]

i'm trying to configure root marker for angular language service

angularls = {
  root_markers = { 'angular.json' },
},

but this is not taking effect:
:checkhealth

vim.lsp: Enabled Configurations ~
- angularls:
  - capabilities: {
      ...
    }
  - cmd: {
     ...
    }
  - filetypes: typescript, html, typescriptreact, typescript.tsx, htmlangular
  - root_markers: angular.json, nx.json

[rivenirvana]

LSP configs are broken right now, requires #1475