TorchANI 2.0

• The dataset API torchani.data has been rewritten. In the new dataset API, we no longer split batches into chunks. Splitting batches into chunks was an optimization to an old implementation of AEVComputer, and it has become a deoptimization. (#428, #405, #404, #456, #434, #433, #432, #431).
• AEVComputer performance improvements and bug fixes (#451, #449, #447, #440, #438, #437, #436, #429, #420, #419, #418, #446)
• Documentation improvements (#460, #442, #425)
• Improvements on vibrational analysis (#427, #413)
• Improve the handle of units (#422)
• Bug fixes in ASE interface (#426, #417, #409)
• Improvements in tool scripts (#412, #411, #410, #435, #453, #430)