Support HTLC interception by source channel #4338
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We jump through some hoops in order to pass a small list of objects to `forward_htlcs` on a per-channel basis rather than per-HTLC. Then, `forward_htlcs` builds a `PendingAddHTLCInfo` for each HTLC for insertion. Worse, in some `forward_htlcs` callsites we're actually starting with a `PendingAddHTLCInfo`, converting it to a tuple, then back inside `forward_htlcs`. Instead, here we just pass a list of built `PendingAddHTLCInfo`s to `forward_htlcs`, cleaning up a good bit of code and even avoiding an allocation of the HTLCs vec in many cases.
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It may be useful in some situations to select HTLCs for interception based on the source channel in addition to the sink. Here we add the ability to do so by adding new flags to `HTLCInterceptionFlags`.
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Just a few more flags and a small cleanup.
Based on #4300