[Merged by Bors] - chore(topology/continuous_function/bounded): generalize from normed_*
to semi_normed_*
#13915
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Every single lemma in this file generalized, apart from the ones that transferred a
normed_*
instance which obviously need the stronger assumption.dist_zero_of_empty
was the only lemma that actually needed reproving from scratch, all the other affected proofs are just split between two instances.