Gather more statistics on current speed/compression status

[sergey-dryabzhinsky]

Create documents (md) with benchmarks for:

• table engines: sqlite, mariadb+myisam, mariadb+innodb
• compression: gzip=1, brotli=0, zstd=1, lz4, lzo ...

Could use libreoffice sources for that - they have many files and huge size.

Put docs with tables and graphics into doc folder.

Update it after adding postgresql db modules and tables.

[sergey-dryabzhinsky]

First doc: https://github.com/sergey-dryabzhinsky/dedupsqlfs/blob/master/docs/benchmarks/2021-04-27_simple_speed_bench_1.2.949.ru.md

[sergey-dryabzhinsky]

Exclude TokuDB and RocksDB - they are slow and not so good at compression.

[sergey-dryabzhinsky]

New docs:

• bench multiple compression methods via 1.2.951
• bench index speed influence

[sergey-dryabzhinsky]

New doc: cython build banchmark

[sergey-dryabzhinsky]

Add more docs with benchmarks: 1.2.952 with updated zstd, lz4, lzo, snappy and many fixes and tweaks.