task: extract out form submission meta to its own class with defined properties

[jwilkinson87]

This pull request refactors how metadata is handled in the FormSubmissionVersion resource. The main change is replacing the generic meta map with a strongly-typed FormSubmissionVersionMeta class, improving type safety and clarity in the codebase. Additionally, the new class is annotated to support proper JSON serialization/deserialization.

Metadata handling improvements:

• Replaced the generic meta: Map<String, Any>? property in FormSubmissionVersion with a strongly-typed meta: FormSubmissionVersionMeta?, and annotated it with @Meta for better JSON:API support. (src/main/kotlin/com/ctrlhub/core/datacapture/resource/FormSubmissionVersion.kt)
• Introduced a new FormSubmissionVersionMeta class with explicit fields for createdAt, latest, and isLatest, each with appropriate JSON annotations and type safety. (src/main/kotlin/com/ctrlhub/core/datacapture/resource/FormSubmissionVersion.kt)

Dependency and import updates:

• Added necessary imports for @Meta and LocalDateTime to support the new metadata structure. (src/main/kotlin/com/ctrlhub/core/datacapture/resource/FormSubmissionVersion.kt)

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