Handle some "human relative dates" in logs and accesslogs

[hsablonniere]

Something like "1 hour ago"...

• Other examples?
• Are there any libs we can use for this?

poke @urcadox @KannarFr

[hsablonniere]

https://www.gnu.org/software/coreutils/manual/html_node/Date-input-formats.html#Date-input-formats

https://www.gnu.org/software/coreutils/manual/html_node/Relative-items-in-date-strings.html#Relative-items-in-date-strings

[hsablonniere]

• https://github.com/derhuerst/parse-human-relative-time
• https://github.com/cmaurer/relative.time.parser
• https://github.com/alanclarke/parse-human-date
• https://github.com/sonirico/datetoken.js
• https://github.com/AdvancedClimateSystems/moment-relativism

[pdesoyres-cc]

Closing as is resolved by https://github.com/CleverCloud/clever-tools/pull/609