bump cosmos-sdk to v0.44.0

[yun-yeo]

Summary of changes

• Bump sdk version to v0.44.0
• Bump ibc-go to v1.2.0
• Bump Tendermint to v0.34.12

Client Breaking Changes

Cosmos SDK stopped supporting legacy amino style transaction, which means /txs endpoint will not be working anymore. However there are so many entities who are still using legacy style transaction building method, so we think
it is necessary to give enough time to prepare for this kind of updates.

To avoid sudden big changes, we introduce our custom /txs endpoint.

• This custom endpoints internally convert the legacy tx into the new proto style tx with some additional inputs.
• Moreover it also give you some space to use new features like fee granter and timeout height.

Our custom /txs endpoint receive more optional inputs as follow

{
  "tx": StdTx,
  "mode": "block" | "sync" | "async",
   // Below fields are newly introduced optional arguments.
   // To convert legacy tx to new proto tx, we need each signer's sequence number. 
   // If this field is not given, we fetch the sequence from the chain state. Normal 
   // users can skip this field as well, but the users who are sending faster than block 
   // time need to provide this field.
  "sequences": ["1", "2"],
  "fee_granter": ""
}

Report of required housekeeping

• Github issue OR spec proposal link
• Wrote tests
• Updated API documentation (client/lcd/swagger-ui/swagger.yaml)
• Added a relevant changelog entry: clog add [section] [stanza] [message]

---

(FOR ADMIN) Before merging

• Added appropriate labels to PR
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)
• Confirm added tests are consistent with the intended behavior of changes
• Ensure all tests pass

[codecov]

Codecov Report

Merging #551 (b28cae3) into main (ea2849c) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #551   +/-   ##
=======================================
  Coverage   44.88%   44.88%           
=======================================
  Files         118      118           
  Lines        6829     6829           
=======================================
  Hits         3065     3065           
  Misses       3527     3527           
  Partials      237      237           

Impacted Files	Coverage Δ
app/app.go	0.67% <0.00%> (ø)

[dimiandre]

The /txs endpoint was removed from Cosmos SDK because of a security vulnerability, have you check to not be affected?

cosmos/cosmos-sdk#10029

[yun-yeo]

The /txs endpoint was removed from Cosmos SDK because of a security vulnerability, have you check to not be affected?

cosmos/cosmos-sdk#10029

Yea we applied some fix to prevent breaking backward compatibility.