add API path for query by id

[rhanka]

IDs are now base on has of INSEE line, which can be use as a unique id (even if INSEE has some fully duplicates lines) (UID source in elasticsearch)

An API path should be used (e.g for permalinks), like : GET /deces/api/v1/id/{id} id could be the hex UID or the base64 URL

[rhanka]

first UID has to be discussed (could be directly in base64url in UID field, and now relies on sha1 of full row, could be sha256 which could be more reliable, even cut to first 16 chars).