Implement node:buffer Blob, File, and object URL parity

[TheHypnoo]

Context

Node's node:buffer module also exposes web-like binary object APIs: Blob, File, and object URL helpers such as resolveObjectURL.

Gap

Perry's current node:buffer work focuses on core Buffer byte behavior and does not implement this Blob/File/object URL surface.

Desired behavior

Future parity should cover at least:

• new Blob([...]).size, .type, .text(), .arrayBuffer()
• new File([...], name, options).name, .lastModified, inherited Blob behavior
• resolveObjectURL(id) behavior for object URLs created through the compatible runtime surface

Suggested implementation notes

This likely belongs in a separate PR because it needs web Blob/File object modeling, async methods/promises, and object URL registry behavior rather than simple Buffer byte helpers.

Parity tests to add

• test-parity/node-suite/buffer/blob-file/blob-basic.ts
• test-parity/node-suite/buffer/blob-file/file-basic.ts
• test-parity/node-suite/buffer/blob-file/object-url.ts

Validation

• ./run_parity_tests.sh --suite node-suite --module buffer