Add DEST record parsing and conversion

[sweep-ai]

Purpose

This pull request adds support for parsing and converting the DEST record in the GEDCOM file format. The DEST record is used to specify the destination system or application that created the GEDCOM file.

Description

The changes in this pull request include:

1. Added a new Dest class in the Gedcom\Parser\Head namespace to handle the parsing of the DEST record.
2. Added a new Dest class in the Gedcom\Record\Head namespace to represent the DEST record.
3. Added a new Dest class in the Gedcom\Writer\Head namespace to handle the conversion of the DEST record back to the GEDCOM format.
4. Updated the Head parser to use the new Dest parser to handle the DEST record.

Summary

• Added Gedcom\Parser\Head\Dest to parse the DEST record
• Added Gedcom\Record\Head\Dest to represent the DEST record
• Added Gedcom\Writer\Head\Dest to convert the DEST record back to GEDCOM format
• Updated Gedcom\Parser\Head to use the new Dest parser

Suggested changes from Sweep Chat by @curtisdelicata. Continue chatting at https://sweep-chat-demo.vercel.app/c/6c525396-9cda-4952-81e6-ee2225231414.