Generate LEM models

[gcatanese]

PR to generate the Legal Entity Management models.

All models have been updated to handle the nullable value (Mustache templates have been updated as part of #1603)

[gemini-code-assist]

Summary of Changes

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This pull request updates all generated Legal Entity Management (LEM) models to provide enhanced control over JSON serialization, specifically regarding nullable values. By introducing explicit flags and a custom serialization method, the models can now differentiate between unset fields and fields explicitly set to null, offering more granular control over API request payloads. This change aligns with previous template updates to improve data representation.

Highlights

• Nullable Value Handling: Introduced explicit handling for nullable values in all Legal Entity Management (LEM) models, allowing for precise control over JSON serialization of null fields.
• Serialization Flags: Added isSet<FieldName> boolean flags for each property in the models to track whether a field has been explicitly set by the user.
• Explicit Null Serialization: Implemented a mechanism using @JsonAnyGetter and an includeNullValues flag to conditionally serialize null properties in the JSON payload, ensuring that nulls are only sent when intended.

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[gemini-code-assist]

Code Review

This pull request introduces a mechanism to handle nullable values in the Legal Entity Management models. The changes are consistent across all modified files, adding isSet... flags for each property and a new getExplicitNulls method to control JSON serialization of nulls. While the implementation is correct, it introduces a large amount of duplicated boilerplate code in each model class. My review includes a suggestion to refactor this into a common base class to improve maintainability.