Number of open connections is configurable #170
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By default, libp2p connection manager has low and high thresholds.
With the changes in this PR, we use the specified limit as the low threshold but allow up to 20% more connections. When we reach the upper bound (checked each 10 seconds), we trim open connections back to the specified value.
Also, we protect boot nodes against pruning, as those are typically higher priority connections like the head node.
Revamp of #162
Sidenote - updated some dependencies to resolve a security issue reported by dependabot.