Is your feature request related to a problem? Please describe

Processing logs in OpenTelemetry format currently has poor performance (around 700 KB/s per core) and allocates on average 3.5 objects per log line.

Describe the solution you'd like

We need to optimize the parsing. General optimization recommendations:

• Avoid unnecessary pointers or consider an arena-style allocator (see example here). Since the OpenTelemetry format is relatively flat, avoiding extra pointers is the simpler option.
• Eliminate memory copies during unmarshal by referencing the original buffer. This will require refactoring the code to use []byte instead of string.

These two optimizations would significantly reduce allocations and improve performance.

Describe alternatives you've considered

No response

Additional information

No response