feat: add delphilsp support

lua/lspconfig/server_configurations/delphi_ls.lua

@@ -0,0 +1,49 @@
+local util = require 'lspconfig.util'
+
+return {
+  default_config = {
+    cmd = { 'DelphiLSP.exe' },
+    filetypes = { 'pascal' },
+    root_dir = util.root_pattern '*.dpr',
+    single_file_support = false,
+  },
+  docs = {
+    description = [[
+Language server for Delphi from Embarcadero.
+https://marketplace.visualstudio.com/items?itemName=EmbarcaderoTechnologies.delphilsp
+
+Note, the '*.delphilsp.json' file is required, more details at:
+https://docwiki.embarcadero.com/RADStudio/Alexandria/en/Using_DelphiLSP_Code_Insight_with_Other_Editors
+
+Below, you'll find a sample configuration for the lazy manager.
+When on_attach is triggered, it signals DelphiLSP to load settings from a configuration file.
+Without this step, DelphiLSP initializes but remains non-functional:
+
+```lua
+"neovim/nvim-lspconfig",
+lazy = false,
+config = function()
+  local capabilities = require("cmp_nvim_lsp").default_capabilities()
+  local lspconfig = require("lspconfig")
+
+  lspconfig.delphi_ls.setup({
+    capabilities = capabilities,
+
+    on_attach = function(client)
+      local lsp_config = vim.fs.find(function(name)
+        return name:match(".*%.delphilsp.json$")
+      end, { type = "file", path = client.config.root_dir, upward = false })[1]
+
+      if lsp_config then
+        client.config.settings = { settingsFile = lsp_config }
+        client.notify("workspace/didChangeConfiguration", { settings = client.config.settings })
+      else
+        vim.notify_once("delphi_ls: '*.delphilsp.json' config file not found")
+      end
+    end,
+  })
+end,
+```
+]],
+  },
+}