Function encode_message 

pub fn encode_message(
    message_descriptor: &MessageDescriptor,
    value: Value,
    options: &Options,
) -> Result<DynamicMessage, String>

Converts a VRL Value into a protobuf DynamicMessage.

Arguments

• message_descriptor - The protobuf message schema descriptor
• value - The VRL value to encode
• options - Encoding options (e.g., whether to use JSON field names)

Returns

Returns Ok(DynamicMessage) on success, or Err(String) with a descriptive error message.

Errors

• Returns an error if value is not a Value::Object
• Returns an error if field type conversion fails (e.g., trying to encode a string as an integer)
• Returns an error if setting a field on the message fails

Behavior

• Only Value::Object is supported, since protobuf messages are collections of named fields
• Fields present in the object with null values are explicitly cleared
• Fields not present in the object retain their default protobuf values
• Type conversion follows the mappings defined in convert_value_raw.