✨ Add support for PEP695 type alias syntax

[stickm4n]

As a language feature for Python 3.12+ was introduced new type-alias definitions.
Reference here

They are not working in sqlmodel hence this PR to support them.

[stickm4n]

@YuriiMotov could you review this and label it?

[YuriiMotov]

Could you please comment on the implementation of the algorithm?
Also, looks like the title and description of PR don't match the changes.
We should either split changes into several PRs (probably preferrable) or update title\description

[stickm4n]

Could you please comment on the implementation of the algorithm?

Also, looks like the title and description of PR don't match the changes.

We should either split changes into several PRs (probably preferrable) or update title\description

Ok, it's a good idea.
I will document the changes referencing all PEPs that are supported with this.
When I was implementing it I noticed there were more type definitions that were not covered.
I thinks it's all type definitions, which are different from alias by variable assignment.

[stickm4n]

@svlandeg could you please take a look at this?

[github-actions]

This pull request has a merge conflict that needs to be resolved.