Problem: state streaming is not supported in old versions

[yihuang]

Solution:

• backport the feature to older version of cosmos-sdk
• integrate the basic file streamer to cronos, further processing can be done based on that

$ cronosd start --trace --streamers file
...
$ check files under $CRONOS_HOME/data/file_streamer/

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PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
• Have you checked your code compiles? (make)
• Have you included tests for any non-trivial functionality?
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• Have you checked your code formatting is correct? (go fmt)
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• If your code changes public APIs, have you incremented the crate version numbers and documented your changes in the CHANGELOG.md?
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Thank you for your code, it's appreciated! :)

[thomas-nguy]

are we planning to upgrade to this version ?

[yihuang]

are we planning to upgrade to this version ?

Yeah, at least deploy to some nodes to get a copy of historical state change stream.

[JayT106]

LGTM