switch lsp to clangd and reconstruct project

xmake.lua

@@ -0,0 +1,15 @@
+--- Generate compile_commands.json for clangd language server
+add_rules("plugin.compile_commands.autoupdate", {outputdir = ".vscode"})
+--- Get C/C++ Lib Path
+local INCLUDE_DIRS = path.splitenv(
+  string.vformat("$(env VERILATOR_INCLUDE):$(env SYSTEMC_INCLUDE)")
+)
+
+target("TB_ISP")
+  set_toolchains("gcc")
+  --- C/C++ Codes
+  add_files(
+    "src/**.cpp"
+  )
+  --- Include directories
+  add_includedirs("src", ".", INCLUDE_DIRS)