Add send total timeout and use dedicated context for metrics #33
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Add a total timeout for a single cycle of broadcast. This is to make sure that the entire broadcast batch is either sent or wiped clean if it cannot be sent. The previous mechanism had timeouts implicitly inside bitswap implementation. The changes here add an explicit timeout to the context used across send.
Use a separate background context for metrics to assure that metrics are collected even if context expires. This is to avoid room for odd numbers being reported by metrics.