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Rust: Add support for lists (and sets) of enum values

Merged Administrator requested to merge github/fork/gferon/rust-array-enums into master

Created by: gferon

For a field described like:

matrixAttributes:
  type: array
  uniqueItems: true
  items:
    type: string
    enum: ["travelTimes", "distances"]
  default: ["travelTimes"]

the generated field in Rust would not be correct and was:

#[serde(rename = "matrixAttributes", skip_serializing_if = "Option::is_none")]
pub matrix_attributes: Option<MatrixAttributes>,

with this patch, it is now correctly wrapped in a collection, depending on whether uniqueItems is set or not:

For a list:

#[serde(rename = "matrixAttributes", skip_serializing_if = "Option::is_none")]
pub matrix_attributes: Option<Vec<MatrixAttributes>>,

For a set:

#[serde(rename = "matrixAttributes", skip_serializing_if = "Option::is_none")]
pub matrix_attributes: Option<std::collections::HashSet<MatrixAttributes>>,

cc @frol (2017/07) @farcaller (2017/08) @richardwhiuk (2019/07) @paladinzh (2020/05) for review