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## Description
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Hello 👋 this PR introduces the second stage of changes to support [ADR-038](https://github.com/cosmos/cosmos-sdk/pull/8012) state listening. This is rebased on top of the [first segment](https://github.com/cosmos/cosmos-sdk/pull/8551), which introduces the low level changes to the MultiStore and KVStore interfaces and implementations, the new WriteListener types, and the new listen.KVStore type.
In this segment we introduce the StreamingService interface, an implementation that writes out to files, and it's integration and configuration at the BaseApp level.
The idea was to have the first segment reviewed independently first but if people think it is easier/more time efficient to review both at the same time then we could start here.
Thanks!
This work is towards satisfying [ADR-038](https://github.com/cosmos/cosmos-sdk/blob/master/docs/architecture/adr-038-state-listening.md)
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## Description
The draft PR #9222Closes: #7108
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- implement proto definition for `Record`
- rename `Info.go` to `legacyInfo.go` within `keyring` package
- implement CLI `migrate` command that migrates all keys from legacyInfo to proto according to @robert-zaremba migration [algorithm](https://github.com/cosmos/cosmos-sdk/pull/9222/#discussion_r624683839)
- remove legacy keybase entirely.
- add `Migrate` and `MigrateAll` functions in `keyring.go` for single key and all keys migration
- add tests
- fix tests
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### Author Checklist
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- [x] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
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### Reviewers Checklist
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* StoreKVPair protobuf message definition and generated go types
* store WriteListener
* update MultiStore, CacheWrap, CacheWrapper interfaces
* adjust KVStores to fit new CacheWrapper interface
* new ListenKVStore
* adjust multistores to fit new MultiStore interface and enable wrapping returned KVStores with the new ListenKVStore
* typo fixes in adr
* ListenKV Store test
* update server mock KVStore and MultiStore
* multistore unit test; fix multistore constructor
* update changelog
* fix bug identified in CI
* improve codecov, minor fixes/adjustments
* review fixes
* review updates; flip set to delete in KVStorePair, updated proto-docs from running 'make proto-gen'
Ian Norden
Andrei Ivasko
Robert Zaremba
Ian Norden
Alexander Bezobchuk
Marko
frog power 4000
Joon