Support for the full static sources

[carlomarxdk]

This pull request introduces improvements to the documentation and validation logic for defining data sources in the project. The main focus is on clarifying how to define sources with static attributes and ensuring that such sources are correctly validated. The changes enhance user guidance and add safeguards to prevent misconfiguration.

Documentation improvements:

• Expanded the quickstart and guide documentation to provide clear examples for defining sources both one-by-one and via SourceCollection, including explicit instructions and code samples for sources with only static attributes. [1] [2] [3]

Validation enhancements:

• Added a model validator to SourceConfig in config.py to ensure that if a source has no temporal columns (i.e., is static), all feature columns must be marked with static=True, raising a helpful error otherwise.

Versioning:

• Bumped the project version from 0.1.9 to 0.1.10 in pyproject.toml to reflect these changes.