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Add proto v2 archive command with HTTP support




This series adds a new protocol v2 command for archiving, and allows
this command to work over HTTP(S). This was previously discussed in [1].
I've CCed everyone who participated in that discussion.

[1]: https://public-inbox.org/git/CANq=j3tK7QeBJOC7VNWkh4+WBNibMJJp5YUkd9te5NaYwukAow@xxxxxxxxxxxxxx/