* Revert "Revert "xDS RouteConfig: use ValidationErrors and add unit test (#31418)" (#31653)"
This reverts commit 335b74fea7.
* use auto instead of explicitly naming the protobuf map type
Specific changes:
- Use absl::variant<> for HashPolicy types.
- Pull validation of resulting LB policy configs out of ClusterSpecifierPlugin registry and into RouteConfig validation.
- Don't ignore missing Any fields in HTTP filter configs if is_optional is true, since is_optional should apply only to unsupported filter types, not to malformed resource protos.
- Use ExtractXdsExtension() for HttpConnectionManager config itself.
- Minor API improvements to StatusCodeSet to make it a bit more useful in tests.
- Changed StringMatcher to return the underlying error message when a regex fails to compile.
- Fix a bug whereby a ClusterSpecifierPlugin would not be returned if it was not used in a vhost, even if it was used in another vhost.
* Revert "Revert "xDS Listener: use ValidationErrors and add unit test (#31351)" (#31456)"
This reverts commit ab3d62ae8f.
* Revert "Revert "xds_http_filters_test: fix includes for import (#31454)" (#31455)"
This reverts commit 32590d110a.
* fix import
* work around internal differences in Any API (string vs. cord)
* iwyu
Additional changes:
- Use absl::variant<> to differentiate between API listeners and TCP listeners.
- Use absl::variant<> to differentiate between an RDS reference and an inline RouteConfig.
- Use common xDS extension code for transport socket extensions in both Listener and Cluster resources.
- Improve xDS HTTP filter registration mechanism.
- Use ValidationErrors for HTTP filter config validation.
* subchannel: include IP address in status messages
* Automated change: Fix sanity tests
* add comment about lock annotations
* clang-format
Co-authored-by: markdroth <markdroth@users.noreply.github.com>