✨Add component that enable to add import

[AdrySky]

Description

This add new component called AddImport that manually added a string import to the code generator script.

Pull Request Type

• Xircuits Core (Jupyterlab Related changes)
• Xircuits Canvas (Custom RD Related changes)
• Xircuits Component Library
• Testing Automation
• Documentation
• Others (Please Specify)

Type of Change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Tests

1. In template category, use the AddImport component.
2. Link a literal string to import_str port.
3. Compile.
4. Check the script and see does it add the import_str's value to the import.

Tested on?

• Windows
• Linux Ubuntu
• Centos
• Mac
• Others (State here -> xxx )

Notes

Only allow one string import per component.

[MFA-X-AI]

Thanks for the PR!
A good addition to the codegen features. From this PR I can add literalVariable so that users can use any import external variables in their codegen. Now it's location in template is a bit odd since it's more of a general component. Might want to consider having a special section for components like these.
Note:
There was a missing self.import_str which I added.