Cosmos-sdk: 0.38.2 Point Release

[alexanderbez]

Cherry-Picks for next point release on 0.38.2:

• [x] #5648
• [x] #5655
• [x] https://github.com/cosmos/cosmos-sdk/pull/5718
• [x] https://github.com/cosmos/cosmos-sdk/pull/5775
• [x] https://github.com/cosmos/cosmos-sdk/pull/5831
• [x] #5620
• [x] #5823
• [x] #5618
• [x] #5739

---

For Admin Use

• [ ] Not duplicate issue
• [ ] Appropriate labels applied
• [ ] Appropriate contributors tagged
• [ ] Contributor assigned/self-assigned

[alessio]

Can we please add the following ones too?

• https://github.com/cosmos/cosmos-sdk/pull/5823
• https://github.com/cosmos/cosmos-sdk/pull/5620
• https://github.com/cosmos/cosmos-sdk/pull/5618
• https://github.com/cosmos/cosmos-sdk/pull/5739