feat(castor): update protos for prism did method

[goncalo-frade-iohk]

By mistake more work was delivered in this branch.

This includes:

• Changes on the SDK folder structure
• Documentation
• Enhanced Error handling and messaging

[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
⚠️ MARKDOWN	markdownlint	19		28	0.39s
❌ MARKDOWN	markdown-link-check	19		5	1.54s
✅ MARKDOWN	markdown-table-formatter	19		0	0.25s
✅ REPOSITORY	checkov	yes		no	13.96s
✅ REPOSITORY	dustilock	yes		no	0.01s
✅ REPOSITORY	git_diff	yes		no	0.08s
✅ REPOSITORY	secretlint	yes		no	2.17s
✅ REPOSITORY	syft	yes		no	4.77s
✅ YAML	prettier	1		0	1.83s
✅ YAML	yamllint	1		0	0.32s

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