On-chain `operator` delegation and `extend_duration` are unreachable from any client

[Jaydbrown]

contracts/stream/src/lib.rs implements set_operator / operator-gated actions (operator_set / operator_revoked events, DataKey::Operator) and extend_duration. Neither streamFi-sdk (src/streams.ts) nor streamFi-app (lib/stream.ts) exposes a wrapper for set_operator, operator revocation, or extend_duration, so no user of the actual product can set an operator or extend a stream. Add SDK + app coverage, or mark the contract methods as not-yet-supported.

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Filed from a codebase review pass.

[Moh-dakai]

Hi i would love to work on this

[babawo96]

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[Kappa16]

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Hi, I'd like to take this on.
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[alfeedrips]

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Can I work on this task?

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[grantfox-oss]

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@alfeedrips's PR #374 was approved and merged by @Jaydbrown.

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