Merge Pydantic Models

[GrandMoff100]

Pydantic models replace JsonModels and allow us to also do data validation and to have more extensive and rigorous type hinting in JSON responses compared to the previous JSON model that was implemented from scratch (not very well admitedly).

[GrandMoff100]

MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	3		0	0.06s
✅ CREDENTIALS	secretlint	yes		no	0.93s
✅ CSS	stylelint	1	0	0	1.25s
✅ GIT	git_diff	yes		no	0.01s
✅ JSON	eslint-plugin-jsonc	2	0	0	1.06s
✅ JSON	jsonlint	2		0	0.59s
✅ JSON	prettier	2	0	0	1.2s
✅ JSON	v8r	2		0	1.96s
✅ MARKDOWN	markdownlint	6	0	0	0.37s
✅ MARKDOWN	markdown-link-check	6		0	1.48s
✅ MARKDOWN	markdown-table-formatter	6	0	0	0.29s
⚠️ SPELL	cspell	25		1	0.65s
✅ SPELL	misspell	25	0	0	0.06s
✅ YAML	prettier	6	0	0	1.35s
✅ YAML	v8r	6		0	6.04s
✅ YAML	yamllint	6		0	0.18s

See errors details in artifact MegaLinter reports on CI Job page