[Feature] Support Textual Inversion

[LeoXing1996]

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Motivation

Support textual inversion

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)

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.

[codecov]

Codecov Report

Patch coverage: 27.08% and project coverage change: -0.30 ⚠️

Comparison is base (c089bec) 82.59% compared to head (62b0980) 82.30%.

❗ Current head 62b0980 differs from pull request most recent head 69aa0e0. Consider uploading reports for the commit 69aa0e0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1822      +/-   ##
==========================================
- Coverage   82.59%   82.30%   -0.30%     
==========================================
  Files         413      416       +3     
  Lines       27811    27954     +143     
  Branches     4366     4375       +9     
==========================================
+ Hits        22971    23008      +37     
- Misses       3895     3997     +102     
- Partials      945      949       +4     

Flag	Coverage Δ
unittests	82.30% <27.08%> (-0.30%)	⬇️

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

Impacted Files	Coverage Δ
mmagic/models/editors/dreambooth/dreambooth.py	62.23% <ø> (ø)
...els/editors/textual_inversion/textual_inversion.py	19.81% <19.81%> (ø)
mmagic/datasets/textual_inversion_dataset.py	40.62% <40.62%> (ø)
mmagic/models/editors/controlnet/controlnet.py	47.36% <50.00%> (-0.46%)	⬇️
mmagic/datasets/__init__.py	100.00% <100.00%> (ø)
mmagic/models/editors/__init__.py	100.00% <100.00%> (ø)
...magic/models/editors/textual_inversion/__init__.py	100.00% <100.00%> (ø)

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[zengyh1900]

lgtm