Fuse futures before loop in process_events_async

[wpaulino]

As per the futures::select documentation:

Futures and streams which are not already fused can be fused using the .fuse() method. Note, though, that fusing a future or stream directly in the call to select! will not be enough to prevent it from being polled after completion if the select! call is in a loop, so when select!ing in a loop, users should take care to fuse() outside of the loop.

In our case, this isn't strictly required as we would always have a new instance of the futures on each poll, but just to be safe, we follow the suggestion anyway. As a result, we generate a new future for each one that has completed, so that we can continue with execution.

[codecov-commenter]

Codecov Report

Base: 90.79% // Head: 90.76% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (1369fc7) compared to base (6738fd5).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1781      +/-   ##
==========================================
- Coverage   90.79%   90.76%   -0.04%     
==========================================
  Files          87       87              
  Lines       46969    46969              
  Branches    46969    46969              
==========================================
- Hits        42646    42631      -15     
- Misses       4323     4338      +15     

Impacted Files	Coverage Δ
lightning-background-processor/src/lib.rs	96.23% <ø> (ø)
lightning/src/chain/onchaintx.rs	94.71% <0.00%> (-0.92%)	⬇️
lightning/src/ln/peer_channel_encryptor.rs	93.38% <0.00%> (-0.25%)	⬇️
lightning/src/ln/functional_tests.rs	96.88% <0.00%> (-0.12%)	⬇️
lightning/src/chain/channelmonitor.rs	91.16% <0.00%> (-0.06%)	⬇️
lightning/src/ln/channelmanager.rs	85.14% <0.00%> (-0.03%)	⬇️
lightning/src/ln/msgs.rs	86.24% <0.00%> (ø)
lightning/src/ln/chan_utils.rs	94.55% <0.00%> (ø)
lightning/src/routing/gossip.rs	92.16% <0.00%> (ø)
lightning/src/routing/scoring.rs	96.61% <0.00%> (ø)

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