design: add proposal for parameterized generic array sizes
design: add proposal for parameterized generic array sizes

Detailed proposal for golang/go#44253.

Change-Id: I9e37363a4d5c41de100def1222d50ff6ad09d078
GitHub-Last-Rev: 8e3bc882aca345c889bc9d810b63cc40129de7cd
GitHub-Pull-Request: golang/proposal#33
Reviewed-on: https://go-review.googlesource.com/c/proposal/+/301290
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

golang/proposal,golang/proposal