feat: implement activity resource and data source

examples/data-sources/immich_activities/data-source.tf

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+data "immich_activities" "album_activities" {
+  album_id = "your-album-uuid"
+}
+
+output "all_comments" {
+  value = [for a in data.immich_activities.album_activities.activities : a.comment if a.type == "COMMENT"]
+}
+
+output "like_count" {
+  value = length([for a in data.immich_activities.album_activities.activities : a if a.type == "LIKE"])
+}

examples/resources/immich_activity/resource.tf

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+resource "immich_activity" "album_comment" {
+  album_id = "your-album-uuid"
+  type     = "comment"
+  comment  = "This is a great album!"
+}
+
+resource "immich_activity" "asset_like" {
+  album_id = "your-album-uuid"
+  asset_id = "your-asset-uuid"
+  type     = "like"
+}