add brotli and zstd to CompressionStream and DecompressionStream types (#25374)

### What does this PR do?

- removes the `Unimplemented in Bun` comment on `CompressionStream` and
`DecompressionStream`
- updates the types for `CompressionStream` and `DecompressionStream` to
add a new internal `CompressionFormat` type to the constructor, which
adds `brotli` and `zstd` to the union
- adds tests for brotli and zstd usage
- adds lib.dom.d.ts exclusions for brotli and zstd as these don't exist
in the DOM version of CompressionFormat

fixes #25367

### How did you verify your code works?

typechecks and tests

packages/bun-types/bun.d.ts

@@ -3887,6 +3887,9 @@ declare module "bun" {
     static readonly byteLength: 32;
   }
 
+  /** Extends the standard web formats with `brotli` and `zstd` support. */
+  type CompressionFormat = "gzip" | "deflate" | "deflate-raw" | "brotli" | "zstd";
+
   /** Compression options for `Bun.deflateSync` and `Bun.gzipSync` */
   interface ZlibCompressionOptions {
     /**

packages/bun-types/globals.d.ts

@@ -83,6 +83,24 @@ declare var WritableStream: Bun.__internal.UseLibDomIfAvailable<
   }
 >;
 
+interface CompressionStream extends Bun.__internal.LibEmptyOrNodeStreamWebCompressionStream {}
+declare var CompressionStream: Bun.__internal.UseLibDomIfAvailable<
+  "CompressionStream",
+  {
+    prototype: CompressionStream;
+    new (format: Bun.CompressionFormat): CompressionStream;
+  }
+>;
+
+interface DecompressionStream extends Bun.__internal.LibEmptyOrNodeStreamWebDecompressionStream {}
+declare var DecompressionStream: Bun.__internal.UseLibDomIfAvailable<
+  "DecompressionStream",
+  {
+    prototype: DecompressionStream;
+    new (format: Bun.CompressionFormat): DecompressionStream;
+  }
+>;
+
 interface Worker extends Bun.__internal.LibWorkerOrBunWorker {}
 declare var Worker: Bun.__internal.UseLibDomIfAvailable<
   "Worker",
@@ -278,30 +296,6 @@ declare var Event: {
   new (type: string, eventInitDict?: Bun.EventInit): Event;
 };
 
-/**
- * Unimplemented in Bun
- */
-interface CompressionStream extends Bun.__internal.LibEmptyOrNodeStreamWebCompressionStream {}
-/**
- * Unimplemented in Bun
- */
-declare var CompressionStream: Bun.__internal.UseLibDomIfAvailable<
-  "CompressionStream",
-  typeof import("node:stream/web").CompressionStream
->;
-
-/**
- * Unimplemented in Bun
- */
-interface DecompressionStream extends Bun.__internal.LibEmptyOrNodeStreamWebCompressionStream {}
-/**
- * Unimplemented in Bun
- */
-declare var DecompressionStream: Bun.__internal.UseLibDomIfAvailable<
-  "DecompressionStream",
-  typeof import("node:stream/web").DecompressionStream
->;
-
 interface EventTarget {
   /**
    * Adds a new handler for the `type` event. Any given `listener` is added only once per `type` and per `capture` option value.