refactor!: move defaults to configuration through setup

Author: mehalter

lua/astrolsp/config.lua

@@ -0,0 +1,19 @@
+return {
+  features = {
+    autoformat_enabled = true,
+    codelens = true,
+    diagnostics_mode = 3,
+    inlay_hints = false,
+    lsp_handlers = true,
+    semantic_tokens = true,
+  },
+  capabilities = {},
+  config = {},
+  diagnostics = {},
+  flags = {},
+  formatting = { format_on_save = { enabled = true }, disabled = {} },
+  mappings = {},
+  servers = {},
+  setup_handlers = { function(server, opts) require("lspconfig")[server].setup(opts) end },
+  on_attach = nil,
+}