perf: bitpack encoding for LID and MID blocks (draft, work in progress)

[cheb0]

Description

Fixes #312

---

• I have read and followed all requirements in CONTRIBUTING.md;
• I used LLM/AI assistance to make this pull request;

If you have used LLM/AI assistance please provide model name and full prompt:

Model: {{model-name}}
Prompt: {{prompt}}

[cheb0]

@seqbenchbot up main search-logbench

[seqbenchbot]

Nice, @cheb0 <(-^,^-)=b!

Your request was successfully served.
Identificator for your ongoing benchmark - acee5e23.

Here is a list of helpful links:

• Take a look at [Grafana](https://comparison.seqbench.ozon.dev/grafana/d/1f4558f2-1bd6-4034-b6db-6607726e78df?var-scenario=search-logbench&var-container=seqbench-seqdb-acee5e23-baseline&var-container=seqbench-seqdb-acee5e23-comparison&from=seqbench-seqdb-acee5e23-comparison%!(EXTRA string=2026-02-06T14:06:53.520Z)) dashboard;
• Live-tailing logs are also available;

Have a great time!