Initial version of the trie module

[vladpaiu]

Summary
Initial version of the trie module

Details
Add a generic trie module implementation.

The drouting module is trying to do too many things at once. For the use cases where we just need maintain and query and internal trie ( and we do not have any gateways/carriers or routing involved ), the trie module provides a more memory efficient alternative.

Furthermore, due to the drouting complexity, we cannot easily update a rule in place and/or delete a prefix rule. The new trie module exposes new upsert&delete MI commands, thus getting rid of the limitation of having to reload the whole dataset in case minor changes need to be made to the trie.

Solution
New trie module.

Compatibility
Backwards compatible