Make Resilient conditionally conform to Equatable and Hashable

[calda]

This PR makes Resilient conditionally conform to Equatable and Hashable when Value conforms to Equatable or Hashable.

This lets us simplify code like:

struct RemoteFileUpload {
  let value: String?
  let fileType: String?
  let fileName: String?
  @Resilient var url: URL?
  let content: Data?
}

/// Manual `Equatable` conformance is required when using `@Resilient`.
extension RemoteFileUpload: Equatable {
  static func ==(lhs: RemoteFileUpload, rhs: RemoteFileUpload) -> Bool {
    lhs.value == rhs.value
      && lhs.fileType == rhs.fileType
      && lhs.fileName == rhs.fileName
      && lhs.url == rhs.url
      && lhs.content == rhs.content
  }
}

to just:

struct RemoteFileUpload: Equatable {
  let value: String?
  let fileType: String?
  let fileName: String?
  @Resilient var url: URL?
  let content: Data?
}

[dfed]

smart. love this. Might make sense to do the same thing with Sendable, but I'd need to think through that one more.

[GeorgeLyon]

👋 You may want to update this documentation as to why we didn't do this in the first place :)
https://github.com/airbnb/ResilientDecoding#why-doesnt-resilient-conform-to-hashable-or-equatable-when-its-value-does

[calda]

Good idea, here you go: #56