Proposal: Vector (#2587)

* Create nnnn-vector.md

Update nnnn-vector.md

Update nnnn-vector.md

Update nnnn-vector.md

* Fix some typos

* Update proposals/nnnn-vector.md

Co-authored-by: Ben Rimmington <[email protected]>

* Update proposals/nnnn-vector.md

Co-authored-by: Ben Rimmington <[email protected]>

* Update proposals/nnnn-vector.md

Co-authored-by: Ben Rimmington <[email protected]>

* Clarify the shadowing rule a little more.

* Change the C interop story to use an upcoming feature instead

* Updates based on forum review

* Update proposals/nnnn-vector.md

Co-authored-by: Ben Rimmington <[email protected]>

* Fix code examples in motivation and proposed solution

Update nnnn-vector.md

* Vector is SE-0453

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Co-authored-by: Ben Rimmington <[email protected]>
Co-authored-by: Freddy Kellison-Linn <[email protected]>

Author: 3 people