64 manager add same trigger restrictions based on blocks 1159

[RawthiL]

Two issues solved in this PR ( #41 and #64 ) .
Also this PR includes many minor fixes to complete a successful generation of scores from an empty DB:

• Added support for signatures evaluation/tracking and added to tokenizers collection.
• Changed how the sidecard provides data (now are proper JSONs) and unified the code with LMEH functions used for tokenizer loading.
• Updated the protocol.py classes adding results and tokenizers database entries.
• Added two collections to hold buffers: buffer_numerical and buffers_signatures. These were removed from nodes collection.
• Added deletion of entries in tasks, instances, results, responses and prompts collections after a successful processing from the Manager.
• Added configuration override to allow a number of tasks to trigger even if the number of samples in the buffer is filled (required by the signatures:tokenizer tasks).
• Fixed some issues with circular buffer calculation.
• Updated the numerical task response format in the Evaluator.