Add components to webhook builders (#324)

* Add components to webhook builders

This adds component fields and DSLs to webhook message builders

* Fix webhook builders allowed_mentions SerialName

rest/src/main/kotlin/builder/webhook/EditWebhookMessageBuilder.kt

@@ -4,7 +4,6 @@ import dev.kord.common.annotation.KordPreview
 import dev.kord.common.entity.AllowedMentions
 import dev.kord.common.entity.optional.Optional
 import dev.kord.common.entity.optional.delegate.delegate
-import dev.kord.common.entity.optional.mapList
 import dev.kord.rest.builder.RequestBuilder
 import dev.kord.rest.builder.component.ActionRowBuilder
 import dev.kord.rest.builder.component.MessageComponentBuilder
@@ -25,29 +24,21 @@ class EditWebhookMessageBuilder : RequestBuilder<MultipartWebhookEditMessageRequ
  private var _content: Optional<String> = Optional.Missing()
  var content: String? by ::_content.delegate()
 
- private var _embeds: Optional<MutableList<EmbedBuilder>> = Optional.Missing()
- var embeds: MutableList<EmbedBuilder>? by ::_embeds.delegate()
+ var embeds: MutableList<EmbedBuilder> = mutableListOf()
 
  val files: MutableList<Pair<String, InputStream>> = mutableListOf()
 
  private var _allowedMentions: Optional<AllowedMentions> = Optional.Missing()
  var allowedMentions: AllowedMentions? by ::_allowedMentions.delegate()
 
- @OptIn(KordPreview::class)
- private var _components: Optional<MutableList<MessageComponentBuilder>> = Optional.Missing()
-
- @KordPreview
- var components: MutableList<MessageComponentBuilder>? by ::_components.delegate()
+ val components: MutableList<MessageComponentBuilder> = mutableListOf()
 
  @OptIn(ExperimentalContracts::class)
  inline fun embed(builder: EmbedBuilder.() -> Unit) {
  contract {
  callsInPlace(builder, InvocationKind.EXACTLY_ONCE)
  }
-
- embeds = (embeds ?: mutableListOf()).also {
- it.add(EmbedBuilder().apply(builder))
- }
+ embeds.add(EmbedBuilder().apply(builder))
  }
 
  fun addFile(name: String, content: InputStream) {
@@ -65,17 +56,15 @@ class EditWebhookMessageBuilder : RequestBuilder<MultipartWebhookEditMessageRequ
  callsInPlace(builder, InvocationKind.EXACTLY_ONCE)
  }
 
- components = (components ?: mutableListOf()).also {
- it.add(ActionRowBuilder().apply(builder))
- }
+ components.add(ActionRowBuilder().apply(builder))
  }
 
  override fun toRequest(): MultipartWebhookEditMessageRequest = MultipartWebhookEditMessageRequest(
  WebhookEditMessageRequest(
  _content,
- _embeds.mapList { it.toRequest() },
+ Optional.missingOnEmpty(embeds.map(EmbedBuilder::toRequest)),
  _allowedMentions,
- _components.mapList { it.build() }
+ Optional.missingOnEmpty(components.map { it.build() })
  ),
  files
  )