Create gather-upstream-feedback.md

Author: subtleGradient

.wishes/gather-upstream-feedback.md

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+.refs/zig-sqlite is a good project
+let's help them
+gather a bunch of ideas for how to make zig-sqlite better
+add them as separate cards to .wishes/blocked-on-tom/*.md
+cross-link them to the relevant places in our codebase
+e.g. zig/src/sqlite/value.zig
+
+eventually, Tom may assign someone to contribute those fixes back upstream
+but for now, let's just focus on capturing these things as potential work way may consider doing