[F] setExtension
function setExtension(   program,   entity,   extensionName,   data): void;Set OpenAPI extension on the given type. Equivalent of using @extension decorator
Parameters
Section titled “Parameters”| Parameter | Type | Description | 
|---|---|---|
| program | Program | Program | 
| entity | Type | Type to annotate | 
| extensionName | string | Extension key | 
| data | unknown | Extension value | 
Returns
Section titled “Returns”void