storage: kafka issue: Can't pickle <class 'cimpl.KafkaException'>: import of module 'cimpl' failed

All _add entrypoints raise that issue at some point or another (not limited to but see [1] [2] [3] for example).

We need to find a way to circumvent this (that's noisy).

Either:

• trap this exception and raise a wrapped swh one

• stop using pickle as serialization?

• other ideas?

• [1] https://sentry.softwareheritage.org/share/issue/2a7f2df8dac3494fae5da930e27e4774/

• [2] https://sentry.softwareheritage.org/share/issue/9bc7f0a095194c07b2b5a9f364c08cea/

• [3] https://sentry.softwareheritage.org/share/issue/11e3f5a116134f469751321aab682775/

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Migrated from T2239 (view on Phabricator)