chore(datastore): return Iterator in MemoryTable.scan

[xuchuan]

Description

Modules

• UI
• Controller
• Agent
• Client
• Python-SDK
• Others

Checklist

• run code format and lint check
• add unit test
• add necessary doc

[codecov]

Codecov Report

Merging #1545 (f1a291d) into main (f4f4384) will decrease coverage by 6.36%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1545      +/-   ##
============================================
- Coverage     82.32%   75.96%   -6.37%     
+ Complexity     1832     1827       -5     
============================================
  Files           327      257      -70     
  Lines         16189     7993    -8196     
  Branches        855      853       -2     
============================================
- Hits          13328     6072    -7256     
+ Misses         2513     1576     -937     
+ Partials        348      345       -3     

Flag	Coverage Δ
controller	75.96% <100.00%> (+0.05%)	⬆️
standalone	?
unittests	?

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

Impacted Files	Coverage Δ
...n/java/ai/starwhale/mlops/datastore/DataStore.java	88.42% <100.00%> (+1.09%)	⬆️
...tarwhale/mlops/datastore/impl/MemoryTableImpl.java	89.10% <100.00%> (+0.47%)	⬆️
client/starwhale/base/cloud.py
client/starwhale/core/dataset/store.py
client/starwhale/core/dataset/view.py
client/starwhale/core/runtime/process.py
client/starwhale/base/uricomponents/resource.py
client/starwhale/utils/process.py
client/starwhale/api/model.py
... and 64 more

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[jialeicui]

LGTM