DOC-6767 added Go scan/buffer API page

[andy-stark-redis]

Note

Low Risk
Documentation and example tests only; no production code or runtime behavior changes.

Overview
Adds a new Go client doc page Handle command results efficiently (scan-buffer.md) that explains mapping Redis results into Go types and using caller-owned buffers for large strings.

The page covers Scan() with redis struct tags on HGETALL / HMGET, ScanSlice() on list commands like LRANGE, and SetFromBuffer() / GetToBuffer() (v9.21.0+), including notes on ZeroCopyStringCmd, no automatic retries on buffer reads, TTL behavior for SetFromBuffer(), and handling buffer too small errors.

A runnable go_scan_buffer example test (scan_buffer_examples_test.go) backs the embedded clients-example steps used throughout the page.

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[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6767-go-redis-page-for-zero-copy-buffer-hash-and-list-returns/develop/clients/go/scan-buffer/

[github-actions]

DOC-6767

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[dwdougherty]

LGTM.

[andy-stark-redis]

Thanks again @dwdougherty - should be the last one for today :-)