Optimize BMA `/wot/certifiers-of/:search` and `/wot/certified-by/:search`

I need to optimize BMA call to:

/wot/certifiers-of/:search
and /wot/certified-by/:search

To keep compatibility with existing clients, we can add a query param ?pubkey to enable search on pubkey only. This should avoid uid search, full scan, etc.

See this post : https://forum.duniter.org/t/bma-ameliorer-les-temps-de-reponse-de-wot-requirements-search/11138Optimize

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