* feat(credentials): store and processing generic app credentials
* feat(credentials): separate module; minimal tests
* more work
* feat(credentials): check presence of idCredential in keystore and add only new membership groups
* feat(credential): refactor, new data structure, dynamic add credential, filter
* feat(credential): add filter, get credentials
* feat(credential): encode/decode utility
* feat(credential): sort groups, test credential retrieval/group merging
* fix(credential): remove unnecessary order in sort
* fix(credentials): fix vendor commits
* fix(credential/rln): embed credential module in rln relay
* feat(credentials/rln): use credentials API in rln-relay to store/read credentials
* refactor(credentials): implement hasKeys for JsonNode
* fix(credentials): restore connectToNodes call
* refactor(credentials): remove unnecessary imports
* refactor(credentials): add Res suffix to results
* refactor(credential): moved save json to separate proc; added comments
* feat(credentials): use appInfo
* refactor(keystore): refactor code in a more structured module; address reviewers
* fix(keystore): fix indentation
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