New API: check Current Database Version

What's Changed

• add language option by @Doarakko in #10
• add validater to options by @Doarakko in #13
• add check db version endpoint by @Doarakko in #14
• use http package const by @Doarakko in #15
• upgrade validator to v10 by @Doarakko in #16
• add golangci by @Doarakko in #17

Full Changelog: 1.1.0...v1.2.0