This makes it easy for Lua filters to base64 escape strings without
needing to provide their own base64 helper.

Signed-off-by: Michael Puncel <[email protected]>

Signed-off-by: Michael Puncel <[email protected]>

Signed-off-by: Michael Puncel <[email protected]>

* master: (67 commits)
  logger: support log control in admin interface and command line option for Fancy Logger (envoyproxy#12369)
  test: fix http_timeout_integration_test flake (envoyproxy#12654)
  [fuzz]added an input check in writefilter fuzzer and added test cases (envoyproxy#12628)
  add 'explicit' restriction. (envoyproxy#12643)
  scoped_rds_integration_test migrate from api v2 to api v3. (envoyproxy#12633)
  fuzz: added fuzz test for listener filter tls_inspector (envoyproxy#12617)
  testing: fix multiple race conditions in simulated time tests (envoyproxy#12527)
  [tls] Move handshaking behavior into SslSocketInfo. (envoyproxy#12571)
  header: getting rid of exception-throwing behaviors in header files [the rest] (envoyproxy#12611)
  router: add new ratelimited retry backoff strategy (envoyproxy#12202)
  [redis_proxy] added a constraint for route.prefix().size() (envoyproxy#12637)
  network: add tcp listener backlog config (envoyproxy#12625)
  runtime: debug log that condition is always true when fractionalPercent numerator > denominator (envoyproxy#12068)
  WatchDog Extension hook (envoyproxy#12416)
  router: add dynamic metadata header formatter (envoyproxy#11858)
  statsd: revert visibility to public (envoyproxy#12621)
  Fix regression of /build_* in gitignore (envoyproxy#12630)
  Added a missing extension point to documentation. (envoyproxy#12620)
  Reverts proxy protocol test on windows (envoyproxy#12619)
  caching: Improved the tests and coverage of the CacheFilter tree (envoyproxy#12544)
  ...

Signed-off-by: Michael Puncel <[email protected]>