Refactor URI handling in ActorStore to improve encoding of unsafe cha…

[WellKnitTech]

…racters. Introduce URI_UNSAFE_PATTERN for better identification of non-ASCII characters in specified fields. Implement encode_uri_field method to ensure proper URI encoding during actor serialization.

Description

Related Issue

Type of Change

• Bug fix (non-breaking change)
• New threat actor (non-breaking change)
• Documentation update
• Code quality improvement

Testing

Checklists

• My code follows the style guidelines
• I have performed a self-review
• I have commented my code where necessary
• I have updated the documentation
• My changes generate no new warnings
• I have added tests that prove my fix works
• New and existing tests pass

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• Data is CC0 licensed
• Data is CC BY 4.0 licensed
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