[Enhance] Support writing data to vis_backend with prefix

[HAOCHENYE]

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Motivation

1. Support log information to various backends(Tensorboard, WandB) with hierarchy
2. Count averaged time and data_time by epoch during validation

Enable log_with_hierarchy in LogProcessor

log_processor = dict(
    log_with_hierarchy=False
)

original layout:

hierarchy layout

As you can see, logs are divided into train and val, and the averaged time, data_time during validation is counted.

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 repos?
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)

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Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

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Additional details and impacted files

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[RangiLyu]

Overall, the current log_processor is becoming more and more complex and less maintainable, are there any plans to streamline the logic?