Add subcrate which impls a simple SPV client from Bitcoin Core RPC#614

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TheBlueMatt wants to merge 2 commits intolightningdevkit:masterfrom

TheBlueMatt:2020-05-rest-chainsync

Commits on May 2, 2020

Expose ChannelMonitor::block_[dis]connected as pub
TheBlueMatt
committed

Commits on May 5, 2020

Add subcrate which impls a simple SPV client from Bitcoin Core RPC
TheBlueMatt
committed