Add DevContainer feature to install apt dependencies defined in an Aptfile.dev file. (devcontainers#514)

Install apt dependencies defined in an `Aptfile.dev` file. This feature is inspired by the approach found in [heroku-buildpack-apt](https://github.com/heroku/heroku-buildpack-apt) and [Aptfile Buildpack on App Platform](https://docs.digitalocean.com/products/app-platform/reference/buildpacks/aptfile/). It simplifies the process of managing and installing apt packages required for a development environment by specifying them in one file.

Author: viktorianer

_data/collection-index.yml

@@ -961,7 +961,12 @@
   maintainer: David Zucker
   contact: https://github.com/davzucky/devcontainers-features-wolfi/issues
   repository: https://github.com/davzucky/devcontainers-features-wolfi
-  ociReference: ghcr.io/davzucky/devcontainers-features-wolfi
+  ociReference: ghcr.io/davzucky/devcontainers-features-wolfi  
+- name: devcontainer feature to install apt dependencies defined in an `Aptfile.dev` file.
+  maintainer: Viktor Schmidt
+  contact: https://github.com/viktorianer/devcontainer-features/issues
+  repository: https://github.com/viktorianer/devcontainer-features/tree/main/src/apt
+  ociReference: ghcr.io/viktorianer/devcontainer-features/apt
 - name: devcontainer features by ChaosWars
   maintainer: ChaosWars
   contact: https://github.com/ChaosWars/vscode-features/issues