Add selected add-ons to the created project's metadata

[ankatiyar]

Description

This is a follow up ticket for #2522
This can be done after the add-ons workflow is in its final iteration of design and implementation.
Once the user creates a new Kedro project with the project creation wizard or using the --addons flag. This information should be added to the user project's pyproject.toml

[tool.kedro]
package_name = "spaceflights"
project_name = "spaceflights"
project_version = "0.18.11"
add_ons = ["1,2,3"] #or ["Linting", "Documentation"] or ["1", "2", "3"] format can be decided later, in agreement with Design

This metadata can then me passed on to kedro-telemetry.

Context

Write up in the comment of the spike ticket #2522 (comment)

Possible Implementation

• Decide on how to add the add ons to the metadata - Should it be a string, list, list of strings, written in number form or as words?

add_ons = ["1,2,3"] or ["Linting", "Documentation"] or ["1", "2", "3"] format can be decided later

This implementation has two things to be done -

1. Make sure when project is created, add-ons is added to the project's pyproject.toml
2. When project metadata is read, add-ons is allowed as a field. This change will go in kedro/framework/startup.py

Possible Alternatives

[merelcht]

Completed in #3188