refactor(dump): type annotations and refactor

[cristianmtr]

@theUnkownName Rebase your PSQL PR when this is merged, as it provides better type hints for the dumping

[codecov]

Codecov Report

Merging #2310 (f0d0aad) into master (8403440) will decrease coverage by 1.64%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2310      +/-   ##
==========================================
- Coverage   90.82%   89.18%   -1.65%     
==========================================
  Files         222      222              
  Lines       11795    11797       +2     
==========================================
- Hits        10713    10521     -192     
- Misses       1082     1276     +194     

Flag	Coverage Δ
daemon	51.14% <62.50%> (-0.01%)	⬇️
jina	89.26% <100.00%> (-1.73%)	⬇️

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Impacted Files	Coverage Δ
jina/executors/indexers/dbms/keyvalue.py	97.29% <100.00%> (ø)
jina/executors/indexers/dump.py	98.57% <100.00%> (+0.04%)	⬆️
jina/helloworld/fashion/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
jina/helloworld/multimodal/__init__.py	0.00% <0.00%> (-90.91%)	⬇️
jina/helloworld/helper.py	0.00% <0.00%> (-90.63%)	⬇️
jina/helloworld/chatbot/__init__.py	0.00% <0.00%> (-89.29%)	⬇️
jina/drivers/convert.py	88.88% <0.00%> (-8.34%)	⬇️
jina/executors/devices.py	50.98% <0.00%> (-5.89%)	⬇️
jina/logging/profile.py	92.18% <0.00%> (-3.91%)	⬇️
jina/parsers/helloworld.py	94.64% <0.00%> (-3.58%)	⬇️
... and 4 more

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[github-actions]

Latency summary

Current PR yields:

• 🐎🐎 index QPS at 1188, delta to last 3 avg.: +10%
• 🐎🐎 query QPS at 17, delta to last 3 avg.: +7%

Breakdown

Version	Index QPS	Query QPS
current	1188	17
1.1.5	1177	17
1.1.4	964	14

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