[error] Improve kernel argument type mismatch error message

[yuanming-hu]

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[codecov]

Codecov Report

Merging #1995 into master will increase coverage by 1.05%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master    #1995      +/-   ##
==========================================
+ Coverage   42.44%   43.50%   +1.05%     
==========================================
  Files          45       45              
  Lines        6476     6266     -210     
  Branches     1109     1109              
==========================================
- Hits         2749     2726      -23     
+ Misses       3552     3367     -185     
+ Partials      175      173       -2     

Impacted Files	Coverage Δ
python/taichi/lang/impl.py	66.40% <0.00%> (+2.71%)	⬆️
python/taichi/lang/kernel.py	73.00% <75.00%> (+1.88%)	⬆️
python/taichi/lang/ast_checker.py	70.58% <0.00%> (-1.64%)	⬇️
python/taichi/testing.py	75.00% <0.00%> (-0.72%)	⬇️
python/taichi/lang/linalg.py	89.33% <0.00%> (-0.67%)	⬇️
python/taichi/lang/__init__.py	40.41% <0.00%> (-0.33%)	⬇️
python/taichi/misc/util.py	20.54% <0.00%> (-0.21%)	⬇️
python/taichi/misc/task.py	0.00% <0.00%> (ø)
python/taichi/tools/patterns.py	0.00% <0.00%> (ø)
... and 10 more

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