Turn IBC back on

[lumtis]

Describe the Issue

IBC has been turned off for v19 release: #2572
This issue is about reenabling the module back once full IBC crosschain integration is implemented.

All lines of codes already exist in the codebase and has been commented out.
The line of code can be found by searching this issue link in the codebase.

• app.go
• init_genesis.go
• setup_handlers.go