feat(ts-md-models): add `placement` property for image

[peterjokumsen]

Summary

Added optional placement property to image model, with string literal values of 'begin' | 'center' | 'end' | 'full'.

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## Related issues Related to #32

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🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
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✅ COPYPASTE	jscpd	yes		no	1.77s
✅ EDITORCONFIG	editorconfig-checker	413		0	1.28s
✅ JSON	jsonlint	77		0	0.42s
✅ JSON	npm-package-json-lint	yes		no	0.64s
✅ JSON	prettier	77		0	6.1s
✅ JSON	v8r	77		0	122.02s
✅ MARKDOWN	markdownlint	21		0	0.91s
✅ MARKDOWN	markdown-link-check	35		0	7.36s
⚠️ MARKDOWN	markdown-table-formatter	35		1	0.37s
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✅ REPOSITORY	trivy	yes		no	20.77s
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✅ REPOSITORY	trufflehog	yes		no	40.29s
✅ SPELL	cspell	415		0	6.6s
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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.82%. Comparing base (11de82c) to head (259365f). Report is 3 commits behind head on main.

Additional details and impacted files

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