feat: allow an output filename to be passed to Diagram explicitly.

This allows you to have a consistent output filename, even if you decide
to tweak the diagram name.

* feat: add custom node class

* docs: add example about custom node

* docs: improve example about custom node usage

* docs: fix variable name

* Add Icon set for Oracle Cloud Services. Update scripts to handle the new provider

* feat: add alibaba cloud resources

* chore: delete unused script

* bump: up to version 0.4.0

* docs: add alibaba cloud

* chore: make a publish script executable

* docs: update menus for alibaba cloud

* Code cleanup per pull request feedback

* Add Oracle cloud to website and command line to generate the classes

* Add missing module script for OCI provider

Co-authored-by: Prodesire <Prodesire@yeah.net>
Co-authored-by: MinJae Kwon <mingrammer@gmail.com>

feat: add alibaba cloud resources

feat: allow custom dot attributes in Diagram constructor

add: contextvars to pyproject.toml