[tmva][sofie] Implement support for dynamic tensor shapes

[lmoneta]

Add support for dynamic tensor shapes in several operators and introduce the managing of a new type of tensors (shape tensors) representing shapes which are the output of some operators (e.g. Shape) and input of others (e.g ConstantOfShape, Reshape, ...), see specific commit for more details.

With this PR we can parse the Atlas GNN dev tracking model, specifying when creating the Session class the maximum number of nodes and edges, in order to allocate the tensors during Session initialization and then using at run time the given edges and nodes sizes.

[github-actions[bot]]

Test Results

    20 files      20 suites   3d 3h 19m 43s ⏱️  3 223 tests  3 223 ✅ 0 💤 0 ❌ 62 775 runs  62 775 ✅ 0 💤 0 ❌

Results for commit 85955561.

:recycle: This comment has been updated with latest results.