Add JPEG 2000 MIME type constants

[Copilot]

Ports MimeTypes.NET commit e9ef782 — adds JPEG 2000 image and video MIME type constants.

New constants

• MimeTypes.Image.Jp2 → image/jp2
• MimeTypes.Image.Jpm → image/jpm
• MimeTypes.Image.Jpx → image/jpx
• MimeTypes.Video.Mj2 → video/mj2

Usage

import { MimeTypes } from "mimetype-constants";

MimeTypes.Image.Jp2  // "image/jp2"
MimeTypes.Image.Jpm  // "image/jpm"
MimeTypes.Image.Jpx  // "image/jpx"
MimeTypes.Video.Mj2  // "video/mj2"

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[markwhitaker]

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