feat: add zstd compression

Closes: geotiffjs#372

src/compression/index.js

@@ -32,4 +32,11 @@ addDecoder(34887, () => import('./lerc.js')
   })
   .then((m) => m.default),
 );
+addDecoder(50000, () => import('./zstd.js')
+  .then(async (m) => {
+    await m.zstd.init();
+    return m;
+  })
+  .then((m) => m.default),
+);
 addDecoder(50001, () => import('./webimage.js').then((m) => m.default));

src/compression/zstd.js

@@ -0,0 +1,10 @@
+import { ZSTDDecoder } from 'zstddec';
+import BaseDecoder from './basedecoder.js';
+
+export const zstd = new ZSTDDecoder();
+
+export default class ZstdDecoder extends BaseDecoder {
+  decodeBlock(buffer) {
+    return zstd.decode(new Uint8Array(buffer)).buffer;
+  }
+}