Remove internal package

[alpe]

After #463

Moves types and keeper one level up.

[ethanfrey]

I'm happy with this when CI is.
Please add an entry to CHANGELOG. This is breaking for all imports.

[codecov]

Codecov Report

Merging #464 (fa58484) into master (63fe568) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #464      +/-   ##
==========================================
+ Coverage   56.76%   56.80%   +0.04%     
==========================================
  Files          40       40              
  Lines        4385     4385              
==========================================
+ Hits         2489     2491       +2     
+ Misses       1685     1684       -1     
+ Partials      211      210       -1     

Impacted Files	Coverage Δ
x/wasm/client/cli/genesis_msg.go	71.96% <ø> (ø)
x/wasm/client/cli/gov_tx.go	0.00% <ø> (ø)
x/wasm/client/cli/new_tx.go	0.00% <ø> (ø)
x/wasm/client/cli/query.go	0.00% <ø> (ø)
x/wasm/client/cli/tx.go	26.24% <ø> (ø)
x/wasm/handler.go	74.28% <ø> (ø)
x/wasm/ibc.go	59.37% <ø> (ø)
x/wasm/keeper/api.go	60.00% <ø> (ø)
x/wasm/keeper/authz_policy.go	100.00% <ø> (ø)
x/wasm/keeper/genesis.go	87.87% <ø> (ø)
... and 24 more

[alpe]

Builds now. Sorry was in a hurry and should have done a draft PR instead. Good to have CI covering me 😅