Move codec.RegisterCrypto and codec.Cdc to new packages (#6330)

* Move codec.Cdc to legacy_global.Cdc

* Update CHANGELOG.md

* Updates

* nit

* Fix imports

* Updates

* Use cosmos multisig instead of tendermint multisig everywhere

* Fix tests

* Rename legacy_global -> legacy

* Add doc.go

* Linting, move all RegisterCrypto calls to crypto/codec

* Update crypto/codec/amino.go

Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>

server/tm_cmds.go

@@ -16,6 +16,7 @@ import (
 	tversion "github.com/tendermint/tendermint/version"
 
 	"github.com/cosmos/cosmos-sdk/codec"
+	cryptocodec "github.com/cosmos/cosmos-sdk/crypto/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
@@ -127,7 +128,7 @@ against which this app has been compiled.
 
 func printlnJSON(v interface{}) error {
 	cdc := codec.New()
-	codec.RegisterCrypto(cdc)
+	cryptocodec.RegisterCrypto(cdc)
 	marshalled, err := cdc.MarshalJSON(v)
 	if err != nil {
 		return err