Changes
* PCBC-527: Initial tracing implementation. The extension checks if libcouchbase has tracing support, and sets up hooks for fetch/persist operations to report encoding/decoding times. This functionality is preview and is not enabled by default.
* PCBC-519: Implement log redaction. When `log_redaction=on` is specified in the connection string, the library will wrap sensitive data in the logs in special tags, which can be processed by the `cblogredaction` tool from the server distribution.