[Doc] add tutorials for level 3 and 4

[wonjuleee]

Summary

Please take a look at http://10.225.20.174:7041/build/html/docs/level-up/basic_skills/03_dataset_import_export.html
and http://10.225.20.174:7041/build/html/docs/level-up/basic_skills/04_detect_data_format.html#level-4-detect-data-format-from-an-unknown-dataset for references.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (89b2111) 78.87% compared to head (b39dcd6) 78.87%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #920   +/-   ##
========================================
  Coverage    78.87%   78.87%           
========================================
  Files          210      215    +5     
  Lines        25145    25220   +75     
  Branches      5036     5046   +10     
========================================
+ Hits         19832    19893   +61     
- Misses        4178     4192   +14     
  Partials      1135     1135           

Flag	Coverage Δ
macos-11_Python-3.8	?
ubuntu-20.04_Python-3.8	78.87% <ø> (+0.01%)	⬆️
windows-2019_Python-3.8	?

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see 55 files with indirect coverage changes

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[vinnamkim]

LGTM.