feat: bump up cosmos-sdk v0.50.6 and cometbft v0.38.6

Description

Closes: #XXXX

Key dependency changes:

Cosmos-SDK v0.45.9 to v0.50.6
CometBFT (Tendermint) v0.34.25 to v0.38.6
ibc-go v3.2.0 to v8.2.1
go-ethereum v1.10.19 to v1.10.26

notable changed files

app/app.go
app/ante/ante.go
app/ante/handler_options.go
app/upgrades/v8/upgrades.go
x/csr/keeper/keeper.go
x/csr/keeper/msg_server.go
x/csr/module.go
x/erc20/keeper/keeper.go
x/erc20/keeper/msg_server.go
x/erc20/module.go
x/govshuttle/keeper/keeper.go
x/govshuttle/keeper/msg_server.go
x/govshuttle/module.go
x/epochs/keeper/keeper.go
x/epochs/keeper/abci.go
x/epochs/module.go
x/inflation/keeper/keeper.go
x/inflation/keeper/hooks.go
x/inflation/module.go
x/coinswap/keeper/keeper.go
x/coinswap/keeper/msg_server.go
x/coinswap/module.go
x/onboarding/ibc_middleware.go
x/onboarding/keeper/keeper.go
x/onboarding/keeper/msg_server.go
x/onboarding/keeper/ibc_callbacks.go
x/onboarding/module.go

app

app.go
- align the overall code with the structure of the cosmos-sdk's app.go, except for some parts related canto's modules and issue(ref. https://github.com/Canto-Network/Canto/issues/122)
ante
- name change and few other structural changes related to authz and issue(ref. https://github.com/Canto-Network/Canto/issues/124)
upgrades.go
- add migration code due to upgrade of cosmos-sdk and ibc-go

modules

cli
- remove legacy REST(ref. https://github.com/cosmos/cosmos-sdk/pull/9594)
msgs
- move ValidateBasic logic to msg_server
- remove funcs like Route, Type, GetSignBytes, GetSigners because they are supported by protobuf. But in case of MsgConvertERC20, GetSigners func is alive and implemented GetSignersFromMsgConvertERC20V2 func additionally.(ref. https://github.com/b-harvest/Canto/pull/53#discussion_r1574149712)
- the module-specific proposal handler and param change was switched to msg level so authority has been added to the required module.(ref. https://github.com/cosmos/cosmos-sdk/issues/10952)
keeper
- KVStore has been changed to use KVStoreService as opposed to the prev way of accessing KVStore via store key.(ref. https://github.com/cosmos/cosmos-sdk/pull/16324, ...)

NOTE

v8 package bump will be done in a separate pr after this pr is merged to avoid amplification of file changes in that pr
x/onboarding module is a feature-driven of the ibc. So, need to ensure that features don't behave differently compared to canto v7, as the version of the ibc-go bump up.
as the versions of different modules in go.mod are upgraded, need to ensure that there are no security issues.

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