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Fix: Change MetadataHandle.await default timeout to :infinity

The 5-second default timeout caused failures on streams taking >5s.
The underlying fetch_fun already has a 300s timeout via
StreamServer.await_metadata, so using :infinity at this layer is safe
and matches user expectations (callers of usage() expect to wait for
the result).

Amp-Thread-ID: https://ampcode.com/threads/T-1955346f-38a9-485e-b216-950b02a7742b
Co-authored-by: Amp <amp@ampcode.com>