Add Transfer special handling to IBC destination callback if it's a transfer message

[chipshort]

Original issue: CosmWasm/cosmwasm#2398
CosmWasm PR: CosmWasm/cosmwasm#2484

[kulikthebird]

Looks good in general. Let's make sure that the two things I've mentioned are checked before merging it.

[kulikthebird]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 11.11111% with 24 lines in your changes missing coverage. Please review.

Project coverage is 44.94%. Comparing base (6ff32cc) to head (5467f1e).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
x/wasm/ibc.go	7.69%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2267      +/-   ##
==========================================
- Coverage   45.03%   44.94%   -0.09%     
==========================================
  Files          80       80              
  Lines       11034    11056      +22     
==========================================
  Hits         4969     4969              
- Misses       5626     5648      +22     
  Partials      439      439              

Files with missing lines	Coverage Δ
app/app.go	86.59% <100.00%> (ø)
x/wasm/ibc.go	12.30% <7.69%> (-1.18%)	⬇️

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[pinosu]

Great work! LGTM 👍