[Feature] add model script, training recipe and training weights of Twins

[TamirBaydasov]

Thank you for your contribution to the MindCV repo. Before submitting this PR, please make sure:

• [x] You have read the Contributing Guidelines on pull requests
• [x] Your code builds clean without any errors or warnings
• [x] You are using approved terminology
• [ ] You have added unit tests

Motivation

add model script, training configs and pretrained weights of Twins models.

Test Plan

please refer to "configs/twins/README.md" for reproducing and testing.

Related Issues and PRs

Related issue: https://github.com/mindspore-lab/mindcv/issues/238