Add search API endpoints that returns package references metadata

See merge request !186068



Merged-by: Dylan Griffith <dyl.griffith@gmail.com>
Approved-by: Moaz Khalifa <mkhalifa@gitlab.com>
Approved-by: Dzmitry (Dima) Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Approved-by: João Pereira <jpereira@gitlab.com>
Approved-by: Dylan Griffith <dyl.griffith@gmail.com>
Reviewed-by: Kamil Trzciński <ayufan@ayufan.eu>
Reviewed-by: Dzmitry (Dima) Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Reviewed-by: Moaz Khalifa <mkhalifa@gitlab.com>
Reviewed-by: Océane Legrand <oceane.legrand@scania.com>
Reviewed-by: Zachary Painter <zpainter@gitlab.com>
Co-authored-by: olzh1h <oceane.legrand@scania.com>