Use seperate folder for rust analzyer

By asking rust analzyer to use a seperate
folder, it means the cache doesn't get
invalidated when running tests or by
running the application under different 
compiler flags.

Having the cache invalidated
dramatically increases the compile times.

.gitignore

@@ -46,3 +46,6 @@ storybook-static
 
 # Vercel
 .vercel
+
+# Rust analyzer
+.rust-analyzer/

.vscode/settings.json

@@ -9,6 +9,9 @@
 	"rust-analyzer.check.command": "clippy",
 	"rust-analyzer.check.allTargets": true,
 	"rust-analyzer.check.features": "all",
+	"rust-analyzer.check.extraArgs": [
+		"--target-dir", ".rust-analyzer/target"
+	],
 	"[rust]": {
 		"editor.defaultFormatter": "rust-lang.rust-analyzer"
 	},