feat: cli improvements

[gzalz]

Problem

• When running create-merkle-tree-collection or create-meta-merkle-tree, the save_path is passed into read_stake_meta_collection and read_merkle_tree_collection, respectively, with a full path. This causes the read functions to look for a file that doesn't exist, as the expected filename gets concatenated onto the save_path.
• As operators, we would like improved visibility into distribution account stats for a given epoch

Solution

• Pass in an unmodified save_path to read functions
• Add get-tip-distribution-stats for printing a table of distribution account stats for an epoch

Example Output

=== Epoch 816 Tip Distribution Statistics ===
Account                                            Total (SOL)     Type       Commission
-------------------------------------------------------------------------------------
3cUygbA1cf7VUtGMd9PzvmEg21NQw71GT2QpjebuY7sa       0.000000        Tip        0.00      
5T5bwrgrogLuVK2HxQp7hLU3G7gDq2ERBxxz2ysi8Fnc       0.005913        Tip        0.00      
DAzWZVkj174fU58RxdVzUhkooh7hMbz68MnKLHpBbHA8       0.000000        Tip        10.00     
6etyciw5RyQc4wF4k7rJseVwcL6GUaNL6qd4mUvLaxpo       0.000693        Tip        10.00     
6517fmyqueqtYHsX1XTLce89qQKz3P18SBadQZwFMude       0.000342        Tip        0.00      
...
6X22eETjFXgnjAkrJD6QwYfJU1M2G4TKsYf7hKkxjQ7v       0.000001        Priority   50.00     
3WLArUmG3hPim8bh3jGvDLQTND3hADTVui34cNhqM1v6       0.000106        Priority   50.00     
EmdsDzsWyVthTdKaPVaa23TuVroo5AxXJ4aaUxn5ayFU       0.000821        Priority   50.00     
-------------------------------------------------------------------------------------
TOTAL                                              44.399631       ALL