aloyszhang opened a new pull request #8618:
URL: https://github.com/apache/pulsar/pull/8618
Fixes #8617
### Motivation
Introduce lightweight raw Message metadata, details can be found
[PIP-70](https://github.com/apache/pulsar/wiki)
### Modifications
1. wire protocol add RawMessageMetadata and supports_raw_message_meta for
FeatureFlags
2. change how produced message is saved in bookkeeper: add raw metadata for
message
3. change how message is seek-by-time
4. change how message send back to Consumer: skip metadata if consumer not
supprot raw metadata
### Verifying this change
- *Added tests for parse/skip raw message metadata*
- *Added test for how message seek-by broker timestamp for message*
### Does this pull request potentially affect one of the following parts:
*If `yes` was chosen, please highlight the changes*
- The wire protocol: (**yes** / no)
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