feat(moqsrc): add configurable max-latency-ms GObject property

[JoaquinBCh]

Summary

• Adds max-latency-ms GObject property to moqsrc (default: 1000ms)
• Parametrizes the hardcoded Duration::from_secs(1) in both video and audio track consumer creation
• Allows callers to tune buffer drop behavior per subscriber instance via g_object_set

Test plan

• Build libgstmoq.so and verify property is registered: gst-inspect-1.0 moqsrc | grep max-latency
• Set property from C: g_object_set(src, "max-latency-ms", (guint64)70, NULL) and confirm no GLib critical warning

(Written by Claude)

[gemini-code-assist]

Code Review

This pull request introduces a configurable max-latency-ms property to the MoqSrc GStreamer element, replacing the hardcoded 1-second latency limit for track consumers. The feedback points out that because settings are only resolved once at session startup, any runtime changes to max-latency-ms while the pipeline is active will be silently ignored. It is recommended to add a warning log if this property is modified during an active session to prevent confusion.

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