Josh Bleecher Snyder deb2f5e793 types/logger: add Context and related helpers
We often need both a log function and a context.
We can do this by adding the log function as a context value.
This commit adds helper glue to make that easy.
It is designed to allow incremental adoption.

Updates tailscale/corp#3138

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-11-30 15:18:21 -08:00
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