Protocol Buffers 25.0

What's new in this version:

Compiler:
- Implement proto2/proto3 with editions
- Defines Protobuf compiler version strings as macros and separates out suffix string definition
- Add utf8_validation feature back to the global feature set
- Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode
- Merge the protobuf and upb Bazel repos
- Editions: Introduce functionality to protoc for generating edition feature set defaults
- Editions: Migrate edition strings to enum in C++ code
- Create a reflection helper for ExtensionIdentifier
- Editions: Provide an API for C++ generators to specify their features
- Editions: Refactor feature resolution to use an intermediate message
- Publish extension declarations with declaration verifications
- Editions: Stop propagating partially resolved feature sets to plugins
- Editions: Migrate string_field_validation to a C++ feature
- Editions: Include defaults for any features in the generated pool
- Protoc: parser rejects explicit use of map_entry option
- Protoc: validate that reserved range start is before end
- Protoc: support identifiers as reserved names in addition to string literals
- Drop support for Bazel 5
- Allow code generators to specify whether or not they support editions

C++:
- Set PROTOBUF_EXPORT on InternalOutOfLineDeleteMessageLite()
- Update stale checked-in files
- Apply PROTOBUF_NOINLINE to declarations of some functions that want it
- Implement proto2/proto3 with editions
- Make JSON UTF-8 boundary check inclusive of the largest possible UTF-8 character
- Reduce Map::size_type to 32-bits. Protobuf containers can't have more than
- Defines Protobuf compiler version strings as macros and separates out suffix string definition
- Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated oneof accessors
- Fix bug in reflection based Swap of map fields
- Add utf8_validation feature back to the global feature set
- Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode
- Add prefetching to arena allocations
- Merge the protobuf and upb Bazel repos
- Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated repeated and map field accessors
- Editions: Migrate edition strings to enum in C++ code
- Workaround ICE on gcc 7.5 by not having one overload call the other one with a
- Create a reflection helper for ExtensionIdentifier
- Editions: Provide an API for C++ generators to specify their features
- Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated string field accessors
- Editions: Refactor feature resolution to use an intermediate message
- Fixes for 32-bit MSVC
- Publish extension declarations with declaration verifications
- Export the constants in protobuf's any.h to support DLL builds
- Implement AbslStringify for the Descriptor family of types
- Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated message field accessors
- Editions: Stop propagating partially resolved feature sets to plugins
- Editions: Migrate string_field_validation to a C++ feature
- Editions: Include defaults for any features in the generated pool
- Introduce C++ feature for UTF8 validation
- Protoc: validate that reserved range start is before end
- Remove option to disable the table-driven parser in protoc
- Lock down ctype=CORD in proto file
- Support split repeated fields
- In OSS mode omit some extern template specializations. We have seen reports of Automated rollback of commit adb2c4b.
- Allow code generators to specify whether or not they support editions
- Handle conflicting macros for FreeBSD

Java:
- Implement proto2/proto3 with editions
- Remove synthetic oneofs from Java gencode field accessor tables
- Timestamps.parse: Add error handling for invalid hours/minutes in the timezone offset
- Defines Protobuf compiler version strings as macros and separates out suffix string definition
- Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated oneof accessors