feat: Event queue early stop in buffer overflow

[abelonogov-ld]

• drop events early (optimization)
• rethrow initialization error (fix oflline)

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Note

Optimizes event batching and improves error handling.

• In EventQueue, introduce SendResult and change batch send([payloads]) to early-stop on total buffer overflow and skip further items for exporters that hit per-exporter limits; send(_:) now returns a result and triggers overflow notifications before stopping.
• In SessionReplayExporter, rethrow initialization errors after logging so callers can handle failures.

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