EPA dataset with Mg/km2/yr Unit

[siddharth0248]

Why are you creating this Pull Request?

• EPA dataset has been transformed with new data units (Mg/km2/yr)
• PR is used to test the units and meet the color map expectations set by EPA team

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[slesaad]

waiting for data publication to production before merging

[siddharth0248]

1. EPA data with new units Mg Ch4/km2/year
2. Custom map added with legends color-bar
3. Content updated based on the feedback
4. Redundant mdx files of EPA (Mg and Tg) deleted
5. Reading the correct STAC collection