docs: define cross-SDK client telemetry conformance

[xiaofan-luan]

Summary

• update the canonical client telemetry MEP for Go, Python, Java, Node, and C++ SDKs
• correct the 10-second heartbeat default
• define the executable cross-SDK contract for logical operation metrics, sampling, collection scopes, command handling, reconnects, acknowledgements, and backoff
• replace the obsolete Go-only implementation status with links to the four SDK implementations under review

The standalone milvus-design-docs repository is archived; the maintained copy now lives under docs/design-docs in this repository.

SDK implementations

• Python: feat: add client telemetry support pymilvus#3770
• Java: feat: add client telemetry support milvus-sdk-java#2040
• Node: feat: add client telemetry support milvus-sdk-node#602
• C++: feat: add client telemetry support milvus-sdk-cpp#585

Verification

• git diff --check origin/master

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[mergify]

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[xiaofan-luan]

Closing because the SDK work implements the existing ClientHeartbeat protocol and canonical design; no separate protocol revision is required.