Add SHARE_CODE resource support to Go SDK

[Copilot]

Implements request and retrieval of SHARE_CODE resources in IDV sessions per SDK-2752.

Session Creation

Added RequiredShareCode model with issuer and scheme fields (no validation):

shareCode, _ := filter.NewRequiredShareCodeBuilder().
    WithIssuer("dvla").
    WithScheme("uk-driving-licence").
    Build()

session, _ := create.NewSessionSpecificationBuilder().
    WithRequiredShareCode(shareCode).
    Build()
// Serializes to: {"required_share_codes":[{"type":"SHARE_CODE","issuer":"dvla","scheme":"uk-driving-licence"}]}

Session Retrieval

Added ShareCodeResourceResponse with:

• Metadata: source, created_at, last_updated
• Media objects: lookup_profile, returned_profile, id_photo, file
• Task filtering for VERIFY_SHARE_CODE_TASK type

result, _ := client.GetSession(sessionID)
for _, shareCode := range result.Resources.ShareCodes {
    tasks := shareCode.VerifyShareCodeTasks()
    // Access shareCode.LookupProfile.Media, etc.
}

Changes

• docscan/session/create/filter/required_share_code.go - Request model with builder
• docscan/session/create/session_spec.go - Added required_share_codes field and builder method
• docscan/session/retrieve/share_code_resource_response.go - Response model with task unmarshalling
• docscan/session/retrieve/verify_share_code_task_response.go - Task wrapper
• docscan/session/retrieve/resource_container.go - Added share_codes array
• docscan/constants/constants.go - Added VERIFY_SHARE_CODE_TASK constant

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