cli: speedup the `swh` cli command startup time

by moving import statements in functions.

Related to swh-environment#2575 (closed).

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Migrated from D3912 (view on Phabricator)

Some references in the commit message have been migrated:

• T2575 is now swh-environment#2575 (closed)

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Rebasing onto 4daf1e41...

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commit 981280cc866e3a3514278923feff32fac5ef8d5d
Author: David Douard <david.douard@sdfa3.org>
Date:   Thu Sep 10 11:01:25 2020 +0200

    cli: speedup the `swh` cli command startup time
    
    by moving import statements in functions.
    
    Related to swh/devel/swh-environment#2575.

See https://jenkins.softwareheritage.org/job/DICP/job/tests-on-diff/3/ for more details.

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