Protocol Buffers 29.0

What's new in this version:

Announcements:
- Protobuf News may include additional announcements or pre-announcements for upcoming changes

Bazel:
- Add missing line to docstring after Args
- Fix proto_info_bzl
- Use rules_cc everywhere in protobuf
- Upgrade rules_cc to 0.0.13
- Convert proto toolchain string to Label
- Prepare supporting targets for testing
- Support --incompatible_enable_proto_toolchain_resolution
- Move ProtoInfo and ProtoLangToolchainInfo from Bazel
- Move java_{lite_}proto_library from Bazel repository
- Move proto_toolchain from rules_proto to protobuf
- Move proto_library from Bazel repository
- Move proto_common implementation from Bazel binary

Compiler:
- Begin adding extension numbers to SourceCodeInfo and FileDescriptorSet for tooling purposes.
- Update protoc release to include editions language features proto for Go
- Introduce lifetimes for individual feature values.
- Windows - Fix handling of utf8 command line arguments
- Limit feature deprecation warnings to reduce noise.

C++:
- Fix C++ ifndef_guard printer to also convert "-" to "_"
- Fix C++ codegen namespace printer to print closing namespaces in reverse order
- Fix raw_ptr.cc on exotic architectures
- Fix cord handling in DynamicMessage and oneofs
- Fix packed reflection handling bug in edition 2023
- Add JsonStreamToMessage method
- Introduce lifetimes for individual feature values
- Insert software prefetches into merge functions. This improves performance when hardware prefetchers are disabled on AMD machines.
- Insert software prefetches into proto parsing functions. This improves performance when hardware prefetchers are disabled on AMD platforms.
- Add prefetching of subsequent extensions in ExtensionSet::ForEach
- Remove the AnyMetadata class and use free functions instead
- Add [[deprecated]] attribute when generating enums and classes
- Use linear search instead of binary search in flat mode of ExtensionSet
- Prepare MessageLite::GetTypeName to be upgraded to return
- Limit feature deprecation warnings to reduce noise
- Add Compiler Condition to use inline assembly optimizations with ARM64 for Compatibility with MSVC
- Enable small object optimization
- Return backing array memory to arena in ExtensionSet
- In edition 2024, Enum_Name(value) functions return absl::string_view by default
- Add Prefetchers to Proto Copy Construct to help address load misses
- Reduced nesting in GenerateByteSize: slight readability improvements in generated code
- Introduce FieldDescriptor::cpp_string_type() API to replace direct ctype inspection which will be removed in the next breaking change
- Update the comment of TextFormat::Printer::RegisterMessagePrinter that the method takes ownerhip of the printer pointer
- Prepare the code for migrating return types from const std::string& to

Java:
- Remove deprecation warnings for Timestamp and Duration add/subtract/between that we do not yet have alternatives to.
- [29.x] Add missing java load
- Give Kotlin jars an OSGi Manifest
- Re-export includingDefaultValueFields in deprecated state for important Cloud customer
- Restore compatibility with 3.22 gencode by re-adding mutableCopy helpers
- Speed up CodedOutputStream by extracting rarely-executed string formatting code
- Return constant Value objects for true, false, and ""
- Optimise CodedOutputStream.ArrayEncoder.writeFixed32NoTag/writeFixed64NoTag
- CodedOutputStream: avoid updating position to go beyond end of array
- Convert IndexOutOfBoundsException to OutOfSpaceException in UnsafeDirectNioEncoder
- Suppress ReturnValueIgnored errorprone issues
- Fix packed reflection handling bug in edition 2023
- Move cc_proto_library from Bazel repository
- Protobuf Lite ArrayLists: Defer allocating backing array until we have some idea how much to allocate
- Allocate correct-sized array when parsing packed fixed-width primitives
- Bugfix: Make extensions beyond n=16 immutable.
- Reserve capacity in ProtobufArrayList when calling Builder.addAllRepeatedMessage(Collection)
- Avoid allocating iterators when calling Message.Builder.addAllFoo(RandomAccess List)
- Remove the AnyMetadata class and use free functions instead