Pydantic models are used more and more in Libervia, for the bridge API, and also to
convert `domish.Element` to internal representation.
Type hints have also been added in many places.
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- Former bookmarks implementation is now labeled as "legacy".
- XEP-0402 is now used for bookmarks when relevant namespaces are found, and it fallbacks
to legacy XEP-0048/XEP-0049 bookmarks otherwise.
- CLI legacy bookmark commands have been moved to `bookmarks legacy`
- CLI bookmarks commands now use the new XEP-0402 (with fallback to legacy one
automatically used if necessary).
Use of `pickle` to serialise data was a technical legacy that was causing trouble to store
in database, to update (if a class was serialised, a change could break update), and to
security (pickle can lead to code execution).
This patch remove all use of Pickle in favour in JSON, notably:
- for caching data, a Pydantic model is now used instead
- for SQLAlchemy model, the LegacyPickle is replaced by JSON serialisation
- in XEP-0373 a class `PublicKeyMetadata` was serialised. New method `from_dict` and
`to_dict` method have been implemented to do serialisation.
- new methods to (de)serialise data can now be specified with Identity data types. It is
notably used to (de)serialise `path` of avatars.
A migration script has been created to convert data (for upgrade or downgrade), with
special care for XEP-0373 case. Depending of size of database, this migration script can
be long to run.
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