Add skonto in sandbox

[skonto]

Add myself as a member in knative-sandbox and as approver for net-{istio, kourier} to help with new features review for example encryption work.

/cc @nak3 @rhuss

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: skonto
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• OWNERS

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[rhuss]

/approve
/lgtm

[evankanderson]

/assign @itsmurugappan

(Since we need someone from Steering for the top-level OWNERS_ALIASES changes)

[itsmurugappan]

/approve
/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: itsmurugappan, rhuss, skonto

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [itsmurugappan]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment