[Refactor] Refactor fileio

[Z-Fran]

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Motivation

Use the new fileio from mmengine
open-mmlab/mmengine#533

Modification

1. modify FileClient to get_file_backend in mmedit/datasets
2. modify FileClient to get_file_backend in mmedit/datasets/transforms
3. modify FileClient to get_file_backend in mmedit/apis
4. modify FileClient to get_file_backend in mmedit/visualization

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.

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

Base: 87.90% // Head: 87.91% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (bc68db6) compared to base (e7c0539).
Patch coverage: 96.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1572      +/-   ##
===========================================
+ Coverage    87.90%   87.91%   +0.01%     
===========================================
  Files          399      399              
  Lines        26015    26024       +9     
  Branches      4044     4048       +4     
===========================================
+ Hits         22868    22879      +11     
  Misses        2240     2240              
+ Partials       907      905       -2     

Flag	Coverage Δ
unittests	87.91% <96.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
mmedit/datasets/data_utils.py	36.47% <71.42%> (ø)
mmedit/visualization/vis_backend.py	92.26% <92.85%> (-0.29%)	⬇️
mmedit/datasets/transforms/loading.py	93.06% <95.23%> (+0.06%)	⬆️
mmedit/apis/inferencers/inference_functions.py	77.56% <100.00%> (ø)
mmedit/datasets/basic_conditional_dataset.py	94.44% <100.00%> (ø)
mmedit/datasets/basic_frames_dataset.py	97.43% <100.00%> (+0.04%)	⬆️
mmedit/datasets/basic_image_dataset.py	97.05% <100.00%> (+0.08%)	⬆️
mmedit/datasets/cifar10_dataset.py	100.00% <100.00%> (ø)
mmedit/datasets/grow_scale_image_dataset.py	98.59% <100.00%> (+1.40%)	⬆️
mmedit/datasets/mscoco_dataset.py	91.42% <100.00%> (ø)
... and 7 more

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[plyfager]

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