New Markets Department within Engineering Division

Why is this change being made?

Adding the first iteration of the new markets proposal in a handbook-first way.

• Engineering Division Handbook Frontpage link: https://vp-of-nm.about.gitlab-review.app/handbook/engineering/#engineering-departments
• New Markets Department Sub-page in Eng Handbook: https://vp-of-nm.about.gitlab-review.app/handbook/engineering/new-markets/
• VP of New Markets Job Family page: https://vp-of-nm.about.gitlab-review.app/job-families/engineering/vp-of-new-markets/

In terms of headcount, I added this above the real-time SEG, which was the lowest priority of the 4, and because this role will hire that role.

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Assign this change to the correct DRI
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