refactor(types): refactor docset.append method

[hanxiao]

No description provided.

[codecov]

Codecov Report

Merging #1399 (b56dc4d) into master (20a77d5) will increase coverage by 0.06%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master    #1399      +/-   ##
==========================================
+ Coverage   83.42%   83.49%   +0.06%     
==========================================
  Files         104      104              
  Lines        6860     6919      +59     
==========================================
+ Hits         5723     5777      +54     
- Misses       1137     1142       +5     

Impacted Files	Coverage Δ
jina/types/document/__init__.py	92.27% <66.66%> (-0.29%)	⬇️
jina/types/sets/chunk_set.py	100.00% <100.00%> (ø)
jina/types/sets/document_set.py	96.47% <100.00%> (+0.12%)	⬆️
jina/types/sets/match_set.py	100.00% <100.00%> (ø)
jina/peapods/grpc_asyncio.py	79.59% <0.00%> (-2.05%)	⬇️
jina/logging/profile.py	55.81% <0.00%> (-0.66%)	⬇️
jina/peapods/pod.py	83.18% <0.00%> (-0.10%)	⬇️
jina/drivers/craft.py	100.00% <0.00%> (ø)
jina/types/ndarray/generic.py	100.00% <0.00%> (ø)
jina/executors/indexers/cache.py	100.00% <0.00%> (ø)
... and 25 more

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