Integrate go-nitro

- Add nitro server and x/nitro module
    - wire go-nitro p2p through cometbft

- Add distsig server, currently WIP
    - integrate DKG and DSS schemes into ABCI methods

- Remove deprecated features
    - crisis module
    - module invariants

- Update to use newer SDK patterns
    - upgrade sdk to v0.53.x
    - custom address codec
    - expand use of depinject
    - migrate e2e tests to system tests
    - use depinject to set up integration tests
    - change reserved protobuf field name `cerc.registry.v1.Record.type`

- Revise & add documentation
    - TransferCoinsToModuleAccount: clarify function

- Update init.sh script

testutil/keyring.go

@@ -0,0 +1,11 @@
+package testutil
+
+import (
+	"github.com/cosmos/cosmos-sdk/crypto/keyring"
+	modtestutil "github.com/cosmos/cosmos-sdk/types/module/testutil"
+)
+
+func NewKeyring() keyring.Keyring {
+	encCfg := modtestutil.MakeTestEncodingConfig()
+	return keyring.NewInMemory(encCfg.Codec)
+}