* RLS LB policy plugin implementation
* Add RLS tests
* rls proto
* generate projects
* Fix adding child policy to child policy map
* Fix issues
* Fix rotten bits
* generate projects
* revert some strange changes
* First batch of fixes
* second batch of addressing comments
* generate_projects
* 3rd batch of fixes
* generate_projects
* 4th batch of fix
* 5th batch of fix
* Empty commit to trigger github PR refresh
* Add insecure build
* generate project
* update picker in a closure
* mutex guard audit
* clang-format
* Aggregate child policy states
* Use OrphanablePtr on ChildPolicyOwner()
* More fixes on comments
* Remove include grpc_security from rls.cc
* Fix key builder test as we removed RlsFindPathFromMetadata
* Update rls proto and add multi-target capability
* code changes to fix build after merging master
* remove support for insecure builds
* WIP
* add LB policy metadata lookup API
* add API for creating errors from C++ strings
* add missing include
* finished updating JSON parsing
* use DualRefCounted<> for ChildPolicyWrapper
* use grpc_core::Mutex instead of std::recursive_mutex
* add lock annotations and fix some lifetime issues
* misc fixes and cleanups
* simplify child policy connectivity state machine
* add comment about hopping into ExecCtx
* don't use wait_for_ready for RLS call
* extraKeys and constantKeys support
* add lock annotations for child policy wrapper connectivity state
* improve logging
* simplify child policy state handling in picker
* use C++ style comments
* remove rls_config.proto, since it's not needed
* rewrote tests
* fix build
* fix copyright headers
* clang-format
* appease clang-tidy
* remove unnecessary dependendency on grpclb
* buildifier
* remove illegal term
* remove unneeded includes
* clang-format
* fix clang-tidy
* fix build
* move class declaration into .cc file
* clang-tidy again
* fix build
* reorganize code and misc cleanups
* clang-format
* fixed a bunch of asan bugs; still some left to debug
* fix asan problem
* make test work on IPv6-only machines
* move LRU list handling into Cache::Entry and add lock annotations
* use preincrement instead of postincrement
* fix deadlock
* add more FIXMEs
* clean up backoff timer logic
* fix build from merge
* clang-format
* fix include path to work on podspec builds
* clean up picker logic
* clang-format
* update rls.proto
* populate reason and stale_header_data in RLS request
* improve logging and fix some cache size type issues
* clang-format
* add some TODOs about a better way to expose channel creds to LB policies
* centralize handling of channel's default authority
* clang-format
* fix backup poller bug
* fix handling of call creds and authority on RLS channel
* remove unused params
* clang-format
* use two-phase update for child policies to avoid deadlocks
* fix portability issue
* minor cleanups
* update for change in grpc_error_get_status() API
* change test to store RLS requests and responses in proto form
* clang-format
* account for test slowdown factor in timeouts
* fix tsan failure and channelz linkage
* fix RLS authority death test
* fix test to not try to connect to target that should not work
* remove illegal term
* cacheSizeBytes is a required field
* add missing BUILD deps from merge
* add tests for connectivity state reporting and fix bugs found
* fix BUILD sanity
* buildifier
* fix BUILD package path
* fix bugs related to child policy lifetime and updates
* remove unnecessary srand() call from grpc_init()
* add test for two cache entries with the same target
* update rls.proto
* change RLS config parser test to support GRPC_ERROR_IS_ABSEIL_STATUS
* update upb codegen
* fix include path
* add env var guard
* avoid duplication of CountedService
* generate_projects
* add upper limit for cacheSizeBytes
* fix build
Co-authored-by: Muxi Yan <mxyan@google.com>