Limit nested container depth in Redis reply and AMF parsers

[wwbmmm]

What problem does this PR solve?

Issue Number: null

Problem Summary:

Redis replies and AMF payloads can contain nested container values. The parsers previously bounded per-container allocation sizes, but did not bound nesting depth. Very deep inputs could therefore consume excessive call stack while parsing.

What is changed and the side effects?

Changed:

• Add redis_max_reply_depth to limit nested Redis array replies.
• Add amf_max_depth to limit nested AMF objects and arrays.
• Add regression tests for over-limit nested Redis replies and AMF strict arrays.

Side effects:

• Performance effects: negligible; parsing adds one integer depth check per nested container.
• Breaking backward compatibility: inputs with Redis reply or AMF nesting deeper than the configured limit are rejected.

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Check List:

• Please make sure your changes are compilable.
• When providing us with a new feature, it is best to add related tests.
• Please follow Contributor Covenant Code of Conduct.

[Copilot]

Pull request overview

This PR adds configurable maximum nesting-depth limits to the Redis reply and AMF parsers to prevent excessively deep inputs from consuming too much call stack during parsing.

Changes:

• Add redis_max_reply_depth and enforce it during recursive Redis array reply parsing.
• Add amf_max_depth and enforce it during recursive AMF object/array parsing.
• Add regression tests for over-limit nested Redis arrays and AMF strict arrays.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/brpc_rtmp_unittest.cpp	Adds a scoped override for amf_max_depth and a regression test for deeply nested AMF strict arrays.
test/brpc_redis_unittest.cpp	Adds a scoped override for redis_max_reply_depth and a regression test for deeply nested Redis array replies.
src/brpc/redis_reply.h	Adds a private depth-tracking overload for RedisReply::ConsumePartialIOBuf.
src/brpc/redis_reply.cpp	Defines redis_max_reply_depth and enforces the limit during recursive array parsing.
src/brpc/amf.cpp	Defines amf_max_depth and enforces it in recursive AMF object/array parsing helpers.

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