Change DB schema

[bizz84]

DB schema changes:

• [x] Changed task id type from Int to Text
• [x] Changed epic id type from Int to Text
• [x] epicId is no longer a primary key in the tasks table
• [x] Added order field to Task and Epic tables, inferred from position in JSON file
• [x] TaskStatusesTable now only has projectId and taskId as custom constraints
• [x] Updated all the queries that rely on the changes above
• [x] renamed task description to name in JSON file
• [x] changed database name (workaround to avoid migration on web)