exchange: return bundle info from getbundlechunks() (API)
We generally want a mechanism to pass information about the generated bundle back to callers (in addition to the byte stream). Ideally we would return a bundler from this function and have the caller code to an interface. But the bundling APIs are not great and getbundlechunks() is the best API we have for obtaining bundle contents in a unified manner. We change getbundlechunks() to return a dict that we can use to communicate metadata. We populate that dict with the bundle version number to demonstrate some value. .. api:: exchange.getbundlechunks() now returns a 2-tuple instead of just an iterator. Differential Revision: https://phab.mercurial-scm.org/D1925
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