feat: migrate to cosmos-sdk v0.50

[matthiasmatt]

• migrate math feat: update dec and int to use cosmossdk.io/math #1872
• migrate to cometBFT
• baseapp
• Config files
• Protobuf fix: remove all stringer for proto types #1874
• SimApp
• Packages
• Modules
• Tooling

[k-yang]

Need to fix linter errors and unit tests on the branch
Need to add upgrade handler

[k-yang]

CI tests are still failing, need to investigate why