Create BottomUpReconciler

[alex-hse-repository]

🚀 Feature Request

Create reconciler implementing Bottom-Up approach

Proposal

1. Create class BottomUpReconciler(BaseReconciler)

• Check that source_level is lower than target_level

3. Implement method fit:
   • Receive dataset on the the level which is lower or equal than target_level, source_level
   • Aggregate the dataset to the source_level
   • Set mapping matrix as summing matrix from source to target level

Test cases

• Test constructor works correctly with different source and target levels
• Test method fit saves the correct matrix in mapping_matrix for different source/target levels
  • source=target
  • source<target
  • source>target

Additional context

No response