Blake 3 instead of md5 for merkle tree

[vstam1]

This Pr changes the rust Merkle tree implementation from a md5 hash to a blake3 hash and implements the same Merkle tree logic inside of python. It also showcases the use of the two implementations together.

To run the interaction example:

1. run cargo run -p tig-utils
2. Copy over the serialized strings from the output into the python main file
3. install python dependencies using pip install -r requirements.txt
4. run python main.py inside the tig-utils directory