test: add basic test

Author: eitsupi

test/r-dependent-packages/DESCRIPTION

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+Package: foo
+Version: 0.0.0.9000
+Suggests:
+    curl

test/r-dependent-packages/r-ver-default.sh

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+#!/usr/bin/env bash
+
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+source dev-container-features-test-lib
+
+# Feature-specific tests
+check "R cli package" R -q -e 'names(installed.packages()[, 3])' | grep curl
+
+# Report result
+reportResults

test/r-dependent-packages/scenarios.json

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+{
+	"r-ver-default": {
+		"image": "rocker/r-ver:4",
+		"features": {
+			"r-dependent-packages": {}
+		}
+	}
+}