TypeDAL 4.0 | Python 3.14 support

[robinvandernoord]

Python 3.14 works, but required some workarounds.
I have updated the annotation parsing logic for the new annotationlib.

• https://github.com/robinvandernoord/pydal-python3.14 is required because the original pydal use urllib.FancyURLopener which is deprecated
• https://github.com/trialandsuccess/psycopg2-python314 is required because psycopg2-binary doesn't have prebuilt wheels for 3.14 yet (uv pip install https://github.com/trialandsuccess/psycopg2-python314/releases/download/psycopg2-2.9.10-cp314-cp314-linux_x86_64-rc2/psycopg2-2.9.10-cp314-cp314-linux_x86_64.whl)

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other Changes

• Add t-string support for python 3.14 to safely quote SQL:

bobby_tables = "Robert'); DROP TABLE Students;--"
rows = db.executesql(t"SELECT * FROM unhackable where name = {bobby_tables}")`

# equals:
# db.executesql("SELECT * FROM unhackable where name = %s", placeholders=[bobby_tables])
# db.executesql("SELECT * FROM unhackable where name = %(name)s", placeholders=dict(name=bobby_tables))

# alternative, even more magical syntax:
name = bobby_tables
rows = db.executesql(t"SELECT * FROM unhackable where {name = }")

• .join() now supports nested relationships: e.g. Article.join("author.articles") to get the article with its author and all articles by that author. (you would access this like article.author.articles)

• core.py has been split up into multiple files to seperate concerns better. External exports are not affected but direct imports from typedal.core could stop working.

• This PR also drops Python 3.10 support since keeping such a wide range of compatibility makes it hard to work with.

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Due to the last two changes which could be potentially breaking, we will conservatively bump this next version to 4.0

[robinvandernoord]

pydal and psycopg2 have been updated to support python 3.14, meaning this PR can be merged and TypeDAL 4.0 can be released!