[Feature] Adopt mmeval's swd and ms-ssim

[LeoXing1996]

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Motivation

In SWD and MS-SSIM are supported in mmeval. Therefore we adopt mmeval's metric in this PR.

Modification

As title.

Who can help? @ them here!

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories? If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Comparison with the old implementation

Config: WGAN-CelebA

MMEval implementation:

Old implementation:

Checklist

Before PR:

• [x] I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• [x] Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• [x] Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• [x] New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• [x] The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• [x] If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects.
• [x] CLA has been signed and all committers have signed the CLA in this PR.