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This commit is based on ff0978ab, and extends #18497 to connect network map caching to the LocalBackend. As implemented, only "whole" netmap values are stored, and we do not yet handle incremental updates. As-written, the feature must be explicitly enabled via the TS_USE_CACHED_NETMAP envknob, and must be considered experimental. Updates #12639 Co-Authored-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I48a1e92facfbf7fb3a8e67cff7f2c9ab4ed62c83 Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>