Document the template_duration in svd_bank match to the actual waveform

We discuss in O4-code-review that the template_duration in svd_bank should be documented as the exact time of waveform, instead of an estimated value from f-low. Basically, lalsimulation slightly adjust the f-low range to match the waveform generation, which results a slightly-longer waveform in time domain. We adjust the template duration to this value.

Also, nicely, I fix the spin1 and spin2 calculation in svd_bank.py and gstlal_inspiral_bank_splitter using numpy.dot.

assigned to @wanting.niu

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• d9bced77 - better coding

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• 966ad8ca - directly read spin1 and spin2 from sngl_inspiral_table

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• 58ff77ff - directly read spin1 and spin2 from sgnl_inspiral_table

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passed the local tests and good to go

merged