* tools/buildgen/extract_metadata_from_bazel_xml.py changes from #25272
* regenerate projects
* get rid of useless _deduplicate_append
* extract_deps worked for both collapsed_sources and collapsed_deps only due to mismatch of bazel label vs target name mismatch
* special handling for absl has no effect
* improve comments
* remove changes that are not needed yet
* Implement the xDS Config Dump as CSDS in Core
* Revemp the logic of caching and constructing the CSDS response
* Unref created error
* Fix the clang tidy complains
* Resolve comments about symbol preload and Json ctor
* Improve readability
* Merge with new ADS logic && support latest CSDS
* Refactor the version/client_status logic
* Add support for error_state
* Add support for does_not_exist
* Add node information
* Fix the ProtoBuf segfault
* More test cases
* Refactor to use bytes as cache instead of JSON
* Apply clang_tidy's suggestion
* Resolve reviewer's requests
* Tiny stylish fixes && make sanity test happy
* WIP: still working on the matchers
* Update a bunch of matchers
* Improve readability a bit
* Resolve reviewer's suggestions
* Resolve reviewer's comments
* Make Unpack fail fast
* Refactored with dynamic filters
* Error-tolerance tuned
* Fix leak of grpc_error and data race of canceller
* Adopt the latest xDS HTTP filter framework
* Fix fault injection tests' conflict with router filter
* Test alternative setup (override, no-override) without copy
* Refactor file strcutures of fault injection filter
* Rewrite the Json parsing/assembling logic again
* Added logic for aborting streaming RPC && resolve comments
* Revert "Revert "xDS HTTP filter support for gRPC client" (#25555)"
This reverts commit 785a128a83.
* xds_end2end_test: avoid flakes from lingering shutdown from previous test
This replaces gflags. Added TODOs where use of `absl::Duration` or `absl::FlagSaver` might be preferred in follow-up cleanup. Fixes#24493.
This reverts commit da66b7d14e.
NEW:
* Adds references to `absl/flags/declare.h`, new to LTS 2020923.2 imported in commit 5b43440.
* Works around MSVC 2017 compiler error with large help text on flags by reducing the help text.