[experiment] add alternative wasm sqlite3 implementation available via build-tag (#2863)

This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).

vendor/github.com/ncruces/go-sqlite3/internal/util/alloc_other.go

@@ -0,0 +1,9 @@
+//go:build !(unix || windows) || sqlite3_nosys
+
+package util
+
+import "github.com/tetratelabs/wazero/experimental"
+
+func virtualAlloc(cap, max uint64) experimental.LinearMemory {
+	return sliceAlloc(cap, max)
+}