[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/vfs/os_std_atomic.go

@@ -0,0 +1,9 @@
+//go:build !linux || !(amd64 || arm64 || riscv64) || sqlite3_nosys
+
+package vfs
+
+import "os"
+
+func osBatchAtomic(*os.File) bool {
+	return false
+}