[Merged by Bors] - feat(analysis/normed_space/basic): add has_nnnorm #7986
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We create here classes `has_nndist` and `has_nnnorm` that are variants of `has_dist` and `has_norm` taking values in `ℝ≥0`. Obvious instances are `pseudo_metric_space` and `semi_normed_group`. These are not used that much in mathlib, but for example `has_nnnorm` is quite convenient for LTE.
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We create here classes
has_nndistandhas_nnnormthat are variants ofhas_distandhas_normtaking values inℝ≥0. Obvious instances arepseudo_metric_spaceandsemi_normed_group.These are not used that much in mathlib, but for example
has_nnnormis quite convenient for LTE.