Add vim/vscode rust-analyzer settings

Signed-off-by: Dave Tucker <dave@dtucker.co.uk>

.vim/coc-settings.json

@@ -0,0 +1,3 @@
+{
+  "rust-analyzer.linkedProjects": ["Cargo.toml", "ebpf/Cargo.toml"]
+}

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "rust-analyzer.linkedProjects": ["Cargo.toml", "ebpf/Cargo.toml"]
+}