feat: Database Lab CLI configuration (#53)

Description

Single CLI can control multiple Database Lab instances

Related issue

Main: (#37 (closed) Database CLI)

Task: (#53 (closed) Database CLI configuration)

Examples

// CLI management
dblab config create ENVIRONMENT_ID
dblab config update ENVIRONMENT_ID
dblab config view [ENVIRONMENT_ID]
dblab config list
dblab config switch ENVIRONMENT_ID
dblab config remove ENVIRONMENT_ID

// Getting started
dblab init

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes