Grégoire HUBERT

add missing aggregator code documentation

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Add missing code documentation in the aggregator library.

database migration framework

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## Content This PR provides a database model layer & stores the database schematic version in the database. ## Pre-submit checklist - Branch - [X] Tests are provided (if possible)...

add API version in HTTP headers

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## Content This patch adds a new HTTP response header that advertise the version of the Mithril Protocol supported by the server. ## Pre-submit checklist - Branch - [ ]...

Use the OpenAPI version and display it in the API HTTP headers (client, aggregator, signer).