[core] Protect session data from unwanted loading. Use specialised Session and Connection types that forward their 'data' and 'session_data' attributes to the pyramid request.session attribute. This forwarding is done with properties, instead of copying a reference, which allow to access request.session (and the session factory) if and only if Session.data or Connection.session_data is accessed. In some cases, most notably the static resources requests, it can mean no access the session during the request handling, which saves a request to the session persistence layer. Closes #4891437

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from cubicweb.cwconfig import CubicWebConfiguration

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def includeme(config):

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    appid = config.registry.settings['cubicweb.instance']

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    cwconfig = CubicWebConfiguration.config_for(appid)

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    config.registry['cubicweb.config'] = cwconfig

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    config.registry['cubicweb.repository'] = repo = cwconfig.repository()

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    config.registry['cubicweb.registry'] = repo.vreg