fix(null-ls): stop null-ls prompt for multiple formaters

add `client.resolved_capabilities.{document_formatting,document_range_formatting}` to on_attach of lspconfig in order to eliminate null-ls prompt for 2 formaters. Not tested with more formaters like in python, I'd say that then it'll prompt still

Signed-off-by: Daniel Boll <danielboll.academico@gmail.com>

lua/plugins/configs/lspconfig.lua

@@ -1,10 +1,12 @@
 require("plugins.configs.others").lsp_handlers()
 
-local function on_attach(_, bufnr)
+local function on_attach(client, bufnr)
    local function buf_set_option(...)
       vim.api.nvim_buf_set_option(bufnr, ...)
    end
 
+   client.resolved_capabilities.document_formatting = false
+   client.resolved_capabilities.document_range_formatting = false
    -- Enable completion triggered by <c-x><c-o>
    buf_set_option("omnifunc", "v:lua.vim.lsp.omnifunc")