Deprecate `scipy.integrate.romberg`/`scipy.integrate.quadrature`?

Hi Team,

`scipy.integrate.romberg` and `scipy.integrate.quadrature` do not reliably
hit their target accuracies, and when they do, they typically require more
function evaluations and take more wall clock time than
`scipy.integrate.quad` (all with default settings). This is documented in
https://github.com/scipy/scipy/issues/18574#issuecomment-1703320598, which
compares the accuracies, function call counts, and wall clock times on a
benchmark set of ~800 integrals with known analytical solutions.

gh-19510 (https://github.com/scipy/scipy/pull/19510) proposes to deprecate
these functions, suggesting `scipy.integrate.quad` as a drop-in
replacement. Please let us know your thoughts either here or in gh-19510!

Thanks,
Matt

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