trim lsp logfile on startup

lua/config/startup.lua

@@ -0,0 +1,12 @@
+local logfile = vim.lsp.log.get_filename()
+
+local tail_process = vim.system({
+    "tail",
+    "-n 10000",
+    logfile,
+}, {}, function(res)
+    vim.schedule(function ()
+        vim.fn.writefile(vim.split(res.stdout, "\n", {plain = true}), logfile)
+    end)
+end)
+