Expose SUR APIs

[williamlardier]

Adding SUR API backend (exposed) to Zenko. CTST tests are added.

[bert-e]

Hello williamlardier,

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name	description	privileged	authored
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name	description	privileged
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Status report is not available.

[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

• 2 peers