multisig payment test

[xandkar]

TODO before merge:

• merge of Multisig support libp2p-crypto#10
• integration of above into libp2p
• update this PR with the tag from above update of libp2p
• remove this PR's direct dep on libp2p_crypto

[codecov]

Codecov Report

Merging #777 (fb4d21c) into master (7943a9b) will increase coverage by 0.22%.
The diff coverage is n/a.

❗ Current head fb4d21c differs from pull request most recent head e399f6e. Consider uploading reports for the commit e399f6e to get more accurate results

@@            Coverage Diff             @@
##           master     #777      +/-   ##
==========================================
+ Coverage   71.43%   71.65%   +0.22%     
==========================================
  Files          97       97              
  Lines       14047    13801     -246     
==========================================
- Hits        10034     9889     -145     
+ Misses       4013     3912     -101     

Impacted Files	Coverage Δ
...state_channel/blockchain_state_channels_server.erl	64.11% <0.00%> (-0.89%)	⬇️
src/transactions/v2/blockchain_txn_payment_v2.erl	95.00% <0.00%> (-0.78%)	⬇️
src/transactions/v1/blockchain_txn_vars_v1.erl	62.55% <0.00%> (-0.31%)	⬇️
src/ledger/v1/blockchain_ledger_snapshot_v1.erl	47.18% <0.00%> (-0.24%)	⬇️
src/blockchain_gateway_cache.erl	55.72% <0.00%> (-0.09%)	⬇️
src/blockchain.erl	63.46% <0.00%> (+0.07%)	⬆️
...transactions/v1/blockchain_txn_poc_receipts_v1.erl	48.55% <0.00%> (+0.08%)	⬆️
src/ledger/v1/blockchain_ledger_v1.erl	80.77% <0.00%> (+0.56%)	⬆️
src/blockchain_worker.erl	36.90% <0.00%> (+1.15%)	⬆️
src/transactions/v1/blockchain_txn_rewards_v1.erl	94.70% <0.00%> (+1.16%)	⬆️
... and 7 more

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