qcscine/database: Release 1.0.0

Initial features: Connection manager for MongoDB servers Definition of specialized classes for data objects that encode chemical reaction networks All functionalities present in C++ and Python3 bindings Initial classes: Structure Compound (aggregate of Structures) ElementaryStep Reaction (aggregate of ElementarySteps) Property (Data class attached to Structures) BoolProperty (bool/bool) NumberProperty (double/float) StringProperty (string/str) VectorProperty (Eigen::VectorXd/numpy.ndarray) DenseMatrixProperty (Eigen::MatrixXd/numpy.ndarray) SparseMatrixProperty (Eigen::SparseMatrix/scipy.sparse.csr_matrix) Calculation Initial collections: structures compounds elementary_steps reactions properties calculation