Fix some Typescript/build output issues

[emma-sg]

Specifically:

• Errors from pako and stream-buffers when used in a project with Typescript where compilerOptions.skipLibCheck is false
• Similar errors from hash-wasm, also when imported in node:

node_modules/warcio/dist/index.d.ts:2:25 - error TS2307: Cannot find module 'hash-wasm/dist/lib/WASMInterface' or its corresponding type declarations.

2 import { IHasher } from 'hash-wasm/dist/lib/WASMInterface';
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Not too sure how to fix this, I'll messing around with how the npm module is packaged maybe.

[ikreymer]

The change suggested in #66 to add a .js to the import and change it to import { IHasher } from 'hash-wasm/dist/lib/WASMInterface.js'; seems to be the only thing that's working to address that, a bit puzzling, but seems to work!