Fix bridge to support transactional calls.

[Neopallium]

Fix bridge pallet to support newer Substrate release.

changelog

new features

• Add a new event BridgeTxFailed to the bridge pallet.

modified logic

• Emit event BridgeTxFailed to report errors (missing CDD, limit reached) when trying to handle a bridge transaction, instead of returning the error. This is needed to support new Substrate release that wrap all calls in transactions.

[codecov[bot]]

Codecov Report

Merging #1373 (5a4150f) into develop (6e24990) will increase coverage by 0.01%. The diff coverage is 71.42%.

:exclamation: Current head 5a4150f differs from pull request most recent head 12c9dd0. Consider uploading reports for the commit 12c9dd0 to get more accurate results

@@             Coverage Diff             @@
##           develop    #1373      +/-   ##
===========================================
+ Coverage    43.35%   43.36%   +0.01%     
===========================================
  Files          140      140              
  Lines        30112    30116       +4     
===========================================
+ Hits         13056    13061       +5     
+ Misses       17056    17055       -1     

Impacted Files	Coverage Δ
pallets/bridge/src/lib.rs	55.35% <71.42%> (+0.24%)	:arrow_up:
pallets/balances/src/lib.rs	57.23% <0.00%> (+0.13%)	:arrow_up: