Add value setter to Gedcom structure

[DavidMStraub]

No description provided.

[Copilot]

Pull request overview

This PR improves the authoring (serialization) ergonomics of the library by (1) making GedcomStructure easier to construct when building trees programmatically, and (2) adding a public set_value helper that writes correctly-formatted payload text from typed values using the structure’s resolved GEDCOM 7 type.

Changes:

• Add default values for GedcomStructure.pointer, GedcomStructure.text, and GedcomStructure.xref so only tag is required for construction.
• Introduce gedcom7.set_value(structure, value, type_id=None) to format and assign payload text based on the resolved structure type (or an explicitly provided type_id).
• Add test coverage for constructor defaults and set_value behavior (type resolution, explicit override, extension passthrough, boolean Y|<NULL> semantics, and serializer round-trip).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/test_types.py	Adds tests validating new GedcomStructure constructor defaults and non-shared child lists.
test/test_format.py	Adds tests covering set_value resolution rules, error cases, and round-trip serialization.
gedcom7/types.py	Makes GedcomStructure’s pointer/text/xref optional via defaults for easier programmatic construction.
gedcom7/format.py	Adds set_value helper built on format_value and structure-type resolution.
gedcom7/init.py	Re-exports set_value as part of the public package API.

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