### What problem does this PR solve?
Define a crypt function in admin directory, remove import from
api.utils. And move requests-toolbelt to dependency.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
This PR is going to make RAGFlow CLI to access RAGFlow as normal user,
and work as the a testing tool for RAGFlow server.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
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Signed-off-by: Jin Hai <haijin.chn@gmail.com>
