lsp: fix rust-analyzer support on neovim and vscode

The project structure was messing with rust-analyzer's ability to correctly find the
Cargo.toml for the {{project-name}}-ebpf crate. This patch fixes it by manually defining
the project structure in both vscode and neovim.

Signed-off-by: William Findlay <william@williamfindlay.com>

.vim/coc-settings.json

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

.vscode/settings.json

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