bug: return the error from Pool.Submit/PoolWithFunc.Invoke accordingly

[panjf2000]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (aee9c2e) 94.08% compared to head (bd637a1) 94.08%.
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #297   +/-   ##
=======================================
  Coverage   94.08%   94.08%           
=======================================
  Files           9        9           
  Lines         744      744           
=======================================
  Hits          700      700           
  Misses         32       32           
  Partials       12       12           

Flag	Coverage Δ
unittests	94.08% <100.00%> (ø)

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Files Changed	Coverage Δ
pool.go	93.80% <100.00%> (ø)
pool_func.go	92.57% <100.00%> (ø)

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