Add trampoline info to auditDB

[thomash-acinq]

Add two columns for the recipient and amount sent to the recipient in case of trampoline relaying.
When using trampoline, the recipient may not be the next node on the path.

[codecov-io]

Codecov Report

Merging #1767 (8e71ec2) into master (357f7f9) will decrease coverage by 0.04%.
The diff coverage is 87.09%.

@@            Coverage Diff             @@
##           master    #1767      +/-   ##
==========================================
- Coverage   89.28%   89.23%   -0.05%     
==========================================
  Files         144      144              
  Lines       10822    10880      +58     
  Branches      494      465      -29     
==========================================
+ Hits         9662     9709      +47     
- Misses       1160     1171      +11     

Impacted Files	Coverage Δ
...main/scala/fr/acinq/eclair/db/DbEventHandler.scala	90.32% <ø> (ø)
.../scala/fr/acinq/eclair/payment/PaymentEvents.scala	97.61% <ø> (ø)
...c/main/scala/fr/acinq/eclair/db/pg/PgAuditDb.scala	96.38% <78.57%> (-2.60%)	⬇️
...cala/fr/acinq/eclair/db/sqlite/SqliteAuditDb.scala	97.95% <93.93%> (-1.12%)	⬇️
...cala/fr/acinq/eclair/payment/relay/NodeRelay.scala	94.02% <100.00%> (ø)
...c/main/scala/fr/acinq/eclair/channel/Channel.scala	86.45% <0.00%> (-0.23%)	⬇️
...main/scala/fr/acinq/eclair/io/PeerConnection.scala	85.10% <0.00%> (+0.42%)	⬆️

[t-bast]

LGTM, only a few nits.
@pm47 has been working on the DB recently, let's wait to see for his review as well.

[t-bast]

🚀