Add a simple send-funds benchmark in channelmanager#860

Merged

TheBlueMatt merged 4 commits intolightningdevkit:mainfrom

TheBlueMatt:2021-03-bench-sends

Apr 1, 2021

Commits on Mar 31, 2021

Commits on Apr 1, 2021

Also benchmark sending funds with a FilesystemPersister
TheBlueMatt
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