fw: implement cs/erase management command - #205
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Implements the cs/erase management command (closes named-data#196), which was previously stubbed out. Erases Content Store entries under the prefix given in ControlParameters.Name on every forwarding thread, honoring the optional Count parameter and capping a single command at 256 entries like NFD's ERASE_LIMIT. The CS is sharded per forwarding thread and guarded by a same-goroutine contract, so the management module fans the request out through a per-thread channel that the forwarding goroutine services from its select loop. The response reports the number of entries erased and sets Capacity when more entries remain, matching NFD's signaling.
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Closes #196
cs/erasepreviously went unanswered because the content-store module had no handler for it. This adds one, mirroring NFD:Adds unit tests for the tree erase and the handler.
go build ./...andgo test ./fw/...pass.