add mesh integration support

[PietroPasotti]

Add support for deploying mongodb charms on an (Istio) service mesh in ambient mode.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/DPE-10137.

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[PietroPasotti]

Working on a courtesy PR to contribute this functionality. We worked on it during an internal 'meshathon' at the eng. sprint.