Add mixed-type GPU arith ops tests and fix Cpr/Mod dispatcher

[jysh1214]

• Skip Int64 vs Int16 Cpr test due to unresolved issue

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.26%. Comparing base (e87c3a2) to head (e5f5cdc).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #730      +/-   ##
==========================================
+ Coverage   32.35%   35.26%   +2.91%     
==========================================
  Files         215      215              
  Lines       36363    33095    -3268     
  Branches    14597    13196    -1401     
==========================================
- Hits        11764    11670      -94     
+ Misses      22659    19511    -3148     
+ Partials     1940     1914      -26     

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[IvanaGyro]

It seems that this test already covers TEST_P(AddTestAllShapes, gpu_tensor_add_tensor_all_types). Is it fine the remove the following one?

Additionally, a comment in #723 mentioned there is a problem of type promotion. Will this problem be addressed in the following changes?

[jysh1214]

Let me modify each unit tests to use mioxed types one by one.