Phase I Study of Irinotecan Liposome (nal-IRI), Fluorouracil and Rucaparib in the Treatment of Select Gastrointestinal Metastatic Malignancies Followed by a Phase Ib of First and Second Line Treatment of both Unselected and Selected ( for BRCA 1/2 and PALB2 Mutations) Patients with Metastatic Adenocarcinoma of the Pancreas then Followed by a Phase II Study of First Line Treatment of Selected Patients with Metastatic Adenocarcinoma of the Pancreas with Genomic Markers (Signature) of Homologous Recombination Deficiency (HRD)