Add winget inputs, install/uninstall scripts, and outputs for PostgreSQL
15, 16 and 17. Each version includes a JSON input manifest,
install/uninstall PowerShell scripts (EnterpriseDB/BitRock installer
with --mode unattended and --unattendedmodeui none), and generated
outputs (per-version windows.json refs and apps.json entries). Also add
frontend SVG icon components and 2x PNG assets for each version to
display in the UI.
