#417 Add a function to create a project

[Only-bottle]

Description

Please include a summary in English, of the changes in this pull request. If it closes an issue, please mention it here.

Closes: #417

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PRs from forked repository not accepted.

Change(s)

• Add project entity and repository class.
• Add contextmanager decorator to get_db.
• Add constant for project.
• Add database save logic for project creation.

Memo

Flow:

1. Check if the project name length is within 30 characters.
2. Combine the project name with the base path to create the project path.
3. Store the absolute path of the project.
4. Check if the project already exists.
   • If it doesn't exist, create sub folders (trained models, compressed models, pretrained models).
5. Save project-related data to the database:
   • Project name
   • User ID
   • Project absolute path