Expose the set of live blob files from Version/VersionSet (#6785)
Summary: The patch adds logic that returns the set of live blob files from `Version::AddLiveFiles` and `VersionSet::AddLiveFiles` (in addition to live table files), and also cleans up the code a bit, for example, by exposing only the numbers of table files as opposed to the earlier `FileDescriptor`s that no clients used. Moreover, the patch extends the `GetLiveFiles` API so that it also exposes blob files in the current version. Similarly to https://github.com/facebook/rocksdb/pull/6755, this is a building block for identifying and purging obsolete blob files. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6785 Test Plan: `make check` Reviewed By: riversand963 Differential Revision: D21336210 Pulled By: ltamasi fbshipit-source-id: fc1aede8a49eacd03caafbc5f6f9ce43b6270821
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