Adds support for IPL-4

[havok2063]

This PR adds support for IPL-4 into valis.

[Copilot]

Pull Request Overview

This PR adds support for IPL-4 by implementing dynamic Astra schema selection based on data release versions. The key changes include updating schema mapping logic to handle the new IPL-4 version (0.8.0) while maintaining backward compatibility with DR19/IPL-3 (0.5.0, 0.6.0).

• Implemented dynamic Astra schema selection in database connection logic
• Enhanced query functions with proper documentation and simplified logic
• Updated data model to make certain fields optional for compatibility

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
python/valis/db/db.py	Added dynamic Astra schema selection based on release version in database connection dependency
python/valis/db/queries.py	Simplified Apogee target retrieval, added comprehensive docstrings, and enhanced schema validation
python/valis/db/models.py	Made several AstraSource fields optional to accommodate schema variations

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[Copilot]

The condition vastra.replace('.', '') not in astra.Source._meta.schema will fail when vastra is None (returned by get_software_tag when release is invalid). This will cause an AttributeError. Add a check for None before calling .replace().

Suggested change

	if vastra.replace('.', '') not in astra.Source._meta.schema:
	if vastra is None or vastra.replace('.', '') not in astra.Source._meta.schema:

[Copilot]

[nitpick] The version mapping logic vastra = \"0.5.0\" if vastra in (\"0.5.0\", \"0.6.0\") else vastra is duplicated in both get_pw_db and get_astra_target. Consider extracting this logic into a shared utility function to improve maintainability.