Add a logger about taichi HOT 10 CLOSED

I haven't found a cross-language logging framework for both C++ and python. Should I write one myself?

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It seems that a basic logger in C++ with binding to python using pybind11 needs < 1000 LoC.

Compile time is an issue if we adopt something (heavy) header-only, as it will be included almost everywhere.

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glog, spdlog, easyloggingpp turns out to be possible options.

I need indentation, however, to make logs more structured.

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Another option is to first use one of them and then hack it to suit Taichi, if license permits.

BTW, it's time to replace printf s.

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glog seems to be too heavy. Let's pick one among 'easyloggingpp' and spdlog.

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https://stackoverflow.com/questions/2353430/how-can-i-print-to-the-console-in-color-in-a-cross-platform-manner

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https://github.com/fmtlib/fmt

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Another feature we want is that the logger output should be easily parsable, using python.
This would be helpful when we want to draw loss curves/convergence curves.

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Let's use spdlog.

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BTW, g3log is also awesome. I just like the bundled fmtlab with spdlog. Latency should not be an issue for taichi.

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