paych maker

[turuslan]

• extract PaychGet from PaymentChannelManager into PaychMaker.

• prevent duplicate channels with same from-to.

• batch pending PaychGet to single message.

• sending one message at a time and waiting before sending next.

• save relevant info to db.

• fix StateWaitMsg lock.

• may rename, e.g. ~router.

[codecov]

Codecov Report

Merging #496 (5e3b40c) into master (6023790) will decrease coverage by 0.20%.
The diff coverage is 1.08%.

@@            Coverage Diff             @@
##           master     #496      +/-   ##
==========================================
- Coverage   46.19%   45.99%   -0.21%     
==========================================
  Files         669      672       +3     
  Lines       29694    29828     +134     
  Branches    16412    16496      +84     
==========================================
  Hits        13718    13718              
- Misses      12042    12176     +134     
  Partials     3934     3934              

Impacted Files	Coverage Δ
core/api/impl/paych_get.hpp	0.00% <0.00%> (ø)
core/node/main/builder.cpp	1.55% <0.00%> (-0.02%)	⬇️
core/payment_channel_manager/impl/maker.cpp	0.00% <0.00%> (ø)
core/payment_channel_manager/impl/maker.hpp	0.00% <0.00%> (ø)
...nnel_manager/impl/payment_channel_manager_impl.cpp	0.00% <ø> (ø)
...ayment_channel_manager/payment_channel_manager.hpp	0.00% <ø> (ø)
core/storage/chain/msg_waiter.cpp	0.00% <0.00%> (ø)
core/storage/leveldb/prefix.hpp	66.66% <ø> (ø)
core/storage/leveldb/prefix.cpp	14.63% <100.00%> (ø)

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