feat: add model script, training configs and trained weights of cait

[wcrzlh]

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• [x] You have read the Contributing Guidelines on pull requests
• [x] Your code builds clean without any errors or warnings
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Motivation

The PR is proposed to add model script, training configs and trained weights of cait.

Test Plan

Please refer to 'configs/cait/README.md' for reproducing and testing.

Related Issues and PRs

Related issue: https://github.com/mindspore-lab/mindcv/issues/424