Log warning instead of fatal when parsing float get under/overflow.

[cyfdecyf]

For texts that resolve to infinity, under or overflow should be accepted.

This should resolve unit test failure mention in #4330.

[StrikerRUS]

Please update cpp tests code.
https://github.com/microsoft/LightGBM/blob/master/tests/cpp_tests/test_common.cpp
Right now UnderOverFlow test is failing with:

...

[ RUN      ] AtofPreciseTest.UnderOverFlow
[LightGBM] [Warning] convert to double got underflow or overflow: 1e+400
/Users/runner/work/1/s/tests/cpp_tests/test_common.cpp:108: Failure
Expected: LightGBM::Common::AtofPrecise("1e+400", &got) throws an exception of type std::runtime_error.
  Actual: it throws nothing.

...

[cyfdecyf]

@StrikerRUS Thanks for spotting this. I ran a single test case and didn't notice there's outdated test case.

Fix pushed.

[StrikerRUS]

Thank you!

I don't think I'm qualified to actually approve this PR, so just commenting.

[shiyu1994]

@cyfdecyf Thanks for your contribution. The changes LGTM.

[github-actions]

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