Create small-prod-builds.md

Author: subtleGradient

.wishes/small-prod-builds.md

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+the old libcrsqlite.{dylib,so,dll} build(s) of the old rust cr-sqlite implementation was chonkier than sqlite itself
+i believe this is because rust includes some about of runtime stuff that gets included in the build
+i expect that a properly optimized build of our zig-based re-implementation should be significantly smaller than sqlite itself
+if our zig build is big, that smells like we screwed something up somehow
+that, or I'm confused about something