Add kv_cache size to pipeline generation log.

[rasapala]

🛠 Summary

JIRA CVS-181044
Depends on https://github.com/openvinotoolkit/openvino.genai/pull/3352/changes and ovms genai update.
Output:
Cache usage 0.5% of 1022.4 MB; for static 1GB
Cache usage 100.0% of 5.2 MB; for dynamic cache_size = 0

For: "usage":{"prompt_tokens":25,"completion_tokens":30,"total_tokens":55}}

🧪 Checklist

• Unit tests added.
• The documentation updated.
• Change follows security best practices.
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[popovaan]

Looks good to me.

[mzegla]

Does not seem to make sense to report 100% of X in every log for dynamic cache size.
It's a minor, but can we drop showing percentage for dynamic cache size and only report size in MB/GB etc. ?