[feature] support stable diffusion inference

[liuwenran]

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Motivation

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Modification

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Checklist

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• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
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[codecov]

Codecov Report

Base: 88.11% // Head: 88.84% // Increases project coverage by +0.73% 🎉

Coverage data is based on head (a3c135b) compared to base (b681559).
Patch coverage: 88.17% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1502      +/-   ##
===========================================
+ Coverage    88.11%   88.84%   +0.73%     
===========================================
  Files          386      394       +8     
  Lines        24442    25596    +1154     
  Branches      3820     3992     +172     
===========================================
+ Hits         21537    22742    +1205     
+ Misses        2085     1967     -118     
- Partials       820      887      +67     

Flag	Coverage Δ
unittests	88.84% <88.17%> (+0.73%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmedit/models/editors/ddim/ddim_scheduler.py	85.39% <33.33%> (+55.84%)	⬆️
mmedit/models/editors/ddpm/ddpm_scheduler.py	81.11% <33.33%> (+65.55%)	⬆️
...odels/editors/stable_diffusion/stable_diffusion.py	70.51% <70.51%> (ø)
...it/models/editors/stable_diffusion/clip_wrapper.py	80.28% <80.28%> (ø)
mmedit/models/editors/ddpm/unet_blocks.py	90.06% <90.06%> (ø)
mmedit/models/editors/ddpm/attention.py	90.69% <90.69%> (ø)
mmedit/models/editors/stable_diffusion/vae.py	90.88% <90.88%> (ø)
mmedit/models/editors/ddpm/denoising_unet.py	80.58% <93.98%> (+23.15%)	⬆️
mmedit/models/editors/ddpm/res_blocks.py	94.59% <94.59%> (ø)
mmedit/models/editors/ddpm/embeddings.py	97.91% <97.91%> (ø)
... and 6 more

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[CLAassistant]

All committers have signed the CLA.

[LeoXing1996]

Good work! This PR looks good to me. 🚀