BUG: Tensor map chunk error when func is `tolist`

[ChengjieLi28]

What do these changes do?

Related issue number

Fixes #696

Check code requirements

• [x] tests added / passed (if needed)
• [x] Ensure all linting tests pass

[codecov[bot]]

Codecov Report

Merging #697 (0d998f6) into main (72b1e36) will increase coverage by 0.22%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #697      +/-   ##
==========================================
+ Coverage   93.27%   93.50%   +0.22%     
==========================================
  Files        1025     1025              
  Lines       79339    79341       +2     
  Branches    16442    16442              
==========================================
+ Hits        74003    74186     +183     
+ Misses       3647     3463     -184     
- Partials     1689     1692       +3     

Flag	Coverage Δ
unittests	93.39% <100.00%> (+0.22%)	:arrow_up:

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

Files Changed	Coverage Δ
python/xorbits/_mars/tensor/core.py	93.47% <100.00%> (+0.04%)	:arrow_up:

... and 15 files with indirect coverage changes