Preparation of Trinuclear Ruthenium Clusters with Capped Sulfide Ligand, (Cp*Ru)3(.mu.3-S)(.mu.3-Cl), (Cp*Ru)3(.mu.3-S)(.mu.3-SiPr), and (Cp*Ru)3(.mu.3-S)2(.mu.2-H) (Cp* = .eta.5-C5Me5), and Reactivities of (Cp*Ru)3(.mu.3-S)(.mu.3-Cl) toward CO and Alkynes