refactor(topology/metric_space/isometry): remove isometry_inv_fun from isometric (#2051)
refactor(topology/metric_space/isometry): remove isometry_inv_fun from isometric (#2051)

* refactor(topology/metric_space/isometry): remove isometry_inv_fun from isometric; it is automatic

* Alternative constructor for isometric bijections

Co-authored-by: mergify[bot] <b09a6ee808b67e98a221404e7aaa52e0398a4954@users.noreply.github.com>

leanprover-community/mathlib,leanprover-community/mathlib