Add strip_prefix Method Based on Longest Match to ZeroTrie

[younies]

In the experimental/unitsconversion/src/measureunit.rs file, we have a get_unit_id function that searches for an item in a ZeroTrie in an inefficient way. The current implementation iterates over each character in the string, creating a new identifier at each step and checking if it exists in the trie. This approach is not optimal.

To improve this, we propose adding a strip_prefix method to the ZeroTrie struct. This method should return the longest matching prefix in the trie and the remaining part of the string (returning the remaining part is optional).

The implementation of strip_prefix should be by searching in the try without needing to create new id/part for each iteration.