Add typo check to CI

[chipshort]

CI config is copied from https://github.com/CosmWasm/cosmwasm/blob/main/.github/workflows/typo-check.yml

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.87%. Comparing base (9c2f332) to head (d824a11).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2032      +/-   ##
==========================================
+ Coverage   42.85%   42.87%   +0.01%     
==========================================
  Files          85       85              
  Lines       11587    11587              
==========================================
+ Hits         4966     4968       +2     
+ Misses       6180     6179       -1     
+ Partials      441      440       -1     

Files with missing lines	Coverage Δ
tests/ibctesting/endpoint.go	0.00% <ø> (ø)
x/wasm/keeper/querier.go	77.27% <100.00%> (ø)
x/wasm/migrations/v1/store.go	80.00% <ø> (ø)
x/wasm/migrations/v2/legacy_types.go	21.81% <ø> (ø)
x/wasm/migrations/v3/legacy_types.go	33.87% <ø> (ø)
x/wasm/types/gas_register.go	97.40% <ø> (ø)
x/wasm/types/keys.go	52.30% <ø> (ø)
x/wasm/types/wasmer_engine.go	0.00% <ø> (ø)

... and 1 file with indirect coverage changes

[chipshort]

I added some excludes here to avoid checking package hashes and generated files. There was already one false-positive in go.sum.

[chipshort]

Also added this, since it is used as a variable name in legacy_types.go

[pinosu]

Nice to have this in wasmd! LGTM 👍