[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/tetratelabs/wazero/internal/wasm/binary/custom.go

@@ -0,0 +1,22 @@
+package binary
+
+import (
+	"bytes"
+
+	"github.com/tetratelabs/wazero/internal/wasm"
+)
+
+// decodeCustomSection deserializes the data **not** associated with the "name" key in SectionIDCustom.
+//
+// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#custom-section%E2%91%A0
+func decodeCustomSection(r *bytes.Reader, name string, limit uint64) (result *wasm.CustomSection, err error) {
+	buf := make([]byte, limit)
+	_, err = r.Read(buf)
+
+	result = &wasm.CustomSection{
+		Name: name,
+		Data: buf,
+	}
+
+	return
+}