Builds a constraint using a left side `A`, a right side `b`, a relaxation parameter `rho`, and a block matrix `block_matrix`.
build.UBayconstraint(A, b, rho, block_matrix = NULL)a `UBayconstraint` object
matrix containing the left side of the linear inequality system
vector containing the right side of the linear inequality system
vector containing the relaxation parameters for each constraint
a matrix indicating the membership of features in feature blocks