refs #178 pghrep: added RawIntFormat func

Description

Values formatting

Related issue

https://gitlab.com/postgres-ai-team/postgres-checkup/issues/178

Examples

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How to debug displayed values

Prepare debug:

CREATE DATABASE test;
su - postgres -c "/usr/pgsql-10/bin/pgbench -i test -p 5432 --foreign-keys"

Debug step:

su - postgres -c "/usr/pgsql-10/bin/pgbench test -p 5432 -t 5000 --no-vacuum"
./checkup -h 127.0.0.1 -p 5432 --username postgres --dbname test --epoch 1 --project test_1 --file resources/checks/K003_top_total_time.sh

Render artifacts/test_1/md_reports/1_TS/K003_top_total_time.md in https://stackedit.io/app#

For debug specific value (for example shared_blks_hit) change order by diff_total_time desc -> order by diff_shared_blks_hit desc in resources/checks/K003_top_total_time.sh