refactor(types): move conversion to mixin, add helper functions 💥

[hanxiao]

Breaking changes:

• .convert_image_datauri_to_blob() is removed and now you should use .convert_image_uri_to_blob() for both URI or dataURI.

New features:

• can dump content directly to a file via .dump_buffer_to_file(), .dump_image_blob_to_file(), .dump_uri_to_file()
• to resize (up/down-sampling) an image blob, use .resize_image_blob()

Misc:

• Fix some bugs in conversion
• Refactor the code for function-reusability and safe access on oneOf fields

[codecov]

Codecov Report

Merging #3750 (cd960d0) into master (e1d650f) will increase coverage by 1.69%.
The diff coverage is 78.37%.

@@            Coverage Diff             @@
##           master    #3750      +/-   ##
==========================================
+ Coverage   87.89%   89.58%   +1.69%     
==========================================
  Files         156      156              
  Lines       11932    11911      -21     
==========================================
+ Hits        10488    10671     +183     
+ Misses       1444     1240     -204     

Flag	Coverage Δ
daemon	44.92% <30.63%> (+0.66%)	⬆️
jina	88.49% <78.37%> (+1.05%)	⬆️

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

Impacted Files	Coverage Δ
jina/helloworld/fashion/my_executors.py	93.15% <50.00%> (ø)
jina/types/document/converters.py	81.04% <76.76%> (-9.76%)	⬇️
jina/helloworld/multimodal/my_executors.py	97.69% <100.00%> (+7.98%)	⬆️
jina/types/document/__init__.py	96.73% <100.00%> (+0.47%)	⬆️
jina/peapods/pods/__init__.py	85.26% <0.00%> (-2.63%)	⬇️
jina/helper.py	82.76% <0.00%> (-0.36%)	⬇️
jina/peapods/runtimes/grpc/__init__.py	87.50% <0.00%> (+0.78%)	⬆️
jina/peapods/runtimes/jinad/__init__.py	85.08% <0.00%> (+0.87%)	⬆️
jina/peapods/zmq/__init__.py	89.06% <0.00%> (+0.93%)	⬆️
... and 19 more

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[github-actions]

Latency summary

Current PR yields:

• 🐢🐢 index QPS at 1184, delta to last 2 avg.: -20%
• 🐢🐢 query QPS at 56, delta to last 2 avg.: -18%
• 🐢🐢 dam extend QPS at 41807, delta to last 2 avg.: -26%
• 🐢🐢 avg flow time within 1.0848 seconds, delta to last 2 avg.: -21%
• 🐎🐎🐎🐎 import jina within 0.4559 seconds, delta to last 2 avg.: +17%

Breakdown

Version	Index QPS	Query QPS	DAM Extend QPS	Avg Flow Time (s)	Import Time (s)
current	1184	56	41807	1.0848	0.4559
2.1.10	1701	79	65360	1.61	0.3175
2.1.9	1262	58	48265	1.1469	0.4596

Backed by latency-tracking. Further commits will update this comment.

[github-actions]

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