[Back-end] Roadmap and order

[stLmpp]

Roadmap and order of tasks:

• [Front-end/Back-end] Add Vitest to the project #13
• [Back-end] Add end-point to get databases #36
• [Back-end] Add end-point to get schedules #39
• [Back-end] Add end-point to get database types #40
• [Back-end] Add end-point to get summary of database #41
• [Back-end] Add end-point to get summary of schedule #42
• [Back-end] Add end-point to add database #43
• [Back-end] Add end-point to add schedule #45
• [Back-end] Add logic of schedulers #46
• [Back-end] Strategy to lock file and update locked files #37
• [Back-end] Check if file is deleted #38
• [Back-end] Implement inactivation of schedule by failure #48
• [Back-end] Add end-point to execute query and update the file #52
• [Back-end] Add end-point to test database connection #53
• [Front-end/Back-end] Migrate from vitest to jest #49