add DDIM to CLIP Guided Stable Diffusion and add code example

[Yam0214]

PR types

Others

PR changes

Others

Description

1. support DDIMScheduler to CLIPGuidedStableDiffusion of community and fix bugs
2. add code example to README.md

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Merging #4920 (a301f61) into develop (8d0801e) will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #4920      +/-   ##
===========================================
+ Coverage    46.32%   46.35%   +0.03%     
===========================================
  Files          448      448              
  Lines        64616    64619       +3     
===========================================
+ Hits         29936    29957      +21     
+ Misses       34680    34662      -18     

Impacted Files	Coverage Δ
paddlenlp/taskflow/text_classification.py	72.15% <0.00%> (-2.85%)	⬇️
...addlenlp/experimental/autonlp/auto_trainer_base.py	89.91% <0.00%> (-0.09%)	⬇️
paddlenlp/utils/downloader.py	65.04% <0.00%> (+0.44%)	⬆️
...dlenlp/experimental/autonlp/text_classification.py	97.20% <0.00%> (+0.52%)	⬆️
paddlenlp/transformers/configuration_utils.py	71.57% <0.00%> (+0.74%)	⬆️
paddlenlp/trainer/trainer_utils.py	45.76% <0.00%> (+5.08%)	⬆️

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[JunnYu]

LGTM