Add the category of pseudo-metric spaces#101
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This PR adds the category of pseudo-metric spaces. It is quite similar to the category of metric spaces, the only recorded difference is that filtered colimits are exact here. Also, the epimorphisms look different.
Maybe later we can also add the category of pseudo-metric spaces where$\infty$ is allowed. This will behave much better.
ℹ️ This PR has been created during recording a video about how to contribute to CatDat. Hence also the unusual account.