[Merged by Bors] - feat(analysis/normed/group/basic): isometry.norm_map_of_map_zero
#14836
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Add the lemma that an isometry of `semi_normed_group`s that preserves 0 preserves the norm.
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…14836) Add the lemma that an isometry of `semi_normed_group`s that preserves 0 preserves the norm.
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isometry.norm_map_of_map_zeroisometry.norm_map_of_map_zero
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Add the lemma that an isometry of
semi_normed_groups that preserves0 preserves the norm.