rust: introduce Repo and Vfs types for filesystem abstraction This is similar to the corresponding Python classes. Repo represents a repository and knows the path to the `.hg` directory, the `store` directory, and the working directory. Separating these will enable supporting the share extension. A Vfs is created from a Repo for one of these three directories. It has filesystem access APIs that take a relative std::path::Path as a parameter. Differential Revision: https://phab.mercurial-scm.org/D9596

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{

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    "conduit_uri": "https://phab.mercurial-scm.org/api",

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    "phabricator.uri": "https://phab.mercurial-scm.org/",

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    "repository.callsign": "HG",

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    "arc.land.onto.default": "@",

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    "base": "hg:.^"

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}