Add extension point for custom ibc port name

[alpe]

🚧 early version

Resolves #1707

[codecov]

Codecov Report

Merging #1710 (88ae8da) into main (4313d7f) will decrease coverage by 0.06%.
The diff coverage is 77.14%.

@@            Coverage Diff             @@
##             main    #1710      +/-   ##
==========================================
- Coverage   57.43%   57.37%   -0.06%     
==========================================
  Files          62       62              
  Lines        8145     8158      +13     
==========================================
+ Hits         4678     4681       +3     
- Misses       3030     3039       +9     
- Partials      437      438       +1     

Files	Coverage Δ
x/wasm/ibc.go	68.71% <100.00%> (ø)
x/wasm/keeper/handler_plugin.go	81.18% <100.00%> (ø)
x/wasm/keeper/handler_plugin_encoders.go	80.89% <100.00%> (ø)
x/wasm/keeper/keeper_cgo.go	94.28% <100.00%> (+0.16%)	⬆️
x/wasm/keeper/options.go	82.45% <100.00%> (+0.63%)	⬆️
x/wasm/keeper/keeper.go	79.52% <50.00%> (-0.50%)	⬇️
x/wasm/keeper/ibc.go	58.33% <40.00%> (-19.45%)	⬇️