fix(document): serialize blob with base64 in dict/json

[hanxiao]

No description provided.

[codecov]

Codecov Report

Merging #63 (74f51c2) into main (e179ef6) will increase coverage by 0.06%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
+ Coverage   82.92%   82.99%   +0.06%     
==========================================
  Files          70       70              
  Lines        3350     3357       +7     
==========================================
+ Hits         2778     2786       +8     
+ Misses        572      571       -1     

Flag	Coverage Δ
docarray	82.99% <90.00%> (+0.06%)	⬆️

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Impacted Files	Coverage Δ
docarray/document/__init__.py	76.00% <ø> (+5.62%)	⬆️
docarray/document/pydantic_model.py	95.00% <83.33%> (-2.06%)	⬇️
docarray/__init__.py	100.00% <100.00%> (ø)
docarray/document/mixins/pydantic.py	88.46% <100.00%> (+0.70%)	⬆️

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