[Enhancement] add sd to inferencer and move mmagic to apis folder

[liuwenran]

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Motivation

Please describe the motivation of this PR and the goal you want to achieve through this PR.

Modification

Please briefly describe what modification is made in this PR.

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.

Use cases (Optional)

from mmagic.apis import MMagicInferencer

# Create a MMEdit instance and infer
editor = MMagicInferencer(model_name='stable_diffusion')
text_prompts = 'A mecha robot in a favela in expressionist style'
result_out_dir = 'resources/output/text2image/tutorial_text2image_sd_res.png'
editor.infer(text=text_prompts, result_out_dir=result_out_dir)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

Before PR:

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

After PR:

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

[LeoXing1996]

Please revise line 60 in configs/controlnet_animation/README.md as well.

[liuwenran]

Please revise line 60 in configs/controlnet_animation/README.md as well.

resolved

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (mmagic@babe8ff). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head fd98fd8 differs from pull request most recent head c063cb9. Consider uploading reports for the commit c063cb9 to get more accurate results

Additional details and impacted files

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##             mmagic    #1797   +/-   ##
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  Hits              ?    22705           
  Misses            ?     3556           
  Partials          ?      912           

Flag	Coverage Δ
unittests	83.55% <0.00%> (?)

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