feat(cli): session pause and resume

[m-alisafaee]

Description

Adds session pause and session resume commands.

Fixes #3621

[coveralls]

Pull Request Test Coverage Report for Build 6474615231

• 47 of 164 (28.66%) changed or added relevant lines in 9 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on 3621-session-hibernation-in-cli at 85.514%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
renku/core/util/requests.py	1	2	50.0%
renku/domain_model/session.py	7	8	87.5%
renku/core/plugin/session.py	2	4	50.0%
renku/ui/cli/utils/plugins.py	1	3	33.33%
renku/command/session.py	5	8	62.5%
renku/ui/cli/utils/click.py	1	7	14.29%
renku/ui/cli/session.py	16	26	61.54%
renku/core/session/renkulab.py	6	39	15.38%
renku/core/session/session.py	8	67	11.94%

Totals
Change from base Build 6474604365:	85.5%
Covered Lines:	26275
Relevant Lines:	30726

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💛 - Coveralls

[Panaetius]

Thank you, looks all good!