ENH: Fix tests hang in CI

[luweizheng]

• Some tests hang. It seems that some processes may not exit correctly and will keep printing following logs. This is a workaround. I split the test cases that hang and test them separately.

Message: 'Actor caller has created too many clients (%s >= 100), the global router may not be set.'

• I move xorbits.pandas and xorbits.numpy from xorbits to test them separately.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.71%. Comparing base (4032b78) to head (dbba1e2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #794      +/-   ##
==========================================
+ Coverage   75.23%   80.71%   +5.47%     
==========================================
  Files        1058     1070      +12     
  Lines       79800    80019     +219     
  Branches    16499    16525      +26     
==========================================
+ Hits        60041    64584    +4543     
+ Misses      18013    13869    -4144     
+ Partials     1746     1566     -180     

Flag	Coverage Δ
unittests	80.66% <ø> (+5.45%)	⬆️

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[qinxuye]

LGTM