[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/function.go

@@ -0,0 +1,56 @@
+package binary
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/tetratelabs/wazero/api"
+	"github.com/tetratelabs/wazero/internal/leb128"
+	"github.com/tetratelabs/wazero/internal/wasm"
+)
+
+func decodeFunctionType(enabledFeatures api.CoreFeatures, r *bytes.Reader, ret *wasm.FunctionType) (err error) {
+	b, err := r.ReadByte()
+	if err != nil {
+		return fmt.Errorf("read leading byte: %w", err)
+	}
+
+	if b != 0x60 {
+		return fmt.Errorf("%w: %#x != 0x60", ErrInvalidByte, b)
+	}
+
+	paramCount, _, err := leb128.DecodeUint32(r)
+	if err != nil {
+		return fmt.Errorf("could not read parameter count: %w", err)
+	}
+
+	paramTypes, err := decodeValueTypes(r, paramCount)
+	if err != nil {
+		return fmt.Errorf("could not read parameter types: %w", err)
+	}
+
+	resultCount, _, err := leb128.DecodeUint32(r)
+	if err != nil {
+		return fmt.Errorf("could not read result count: %w", err)
+	}
+
+	// Guard >1.0 feature multi-value
+	if resultCount > 1 {
+		if err = enabledFeatures.RequireEnabled(api.CoreFeatureMultiValue); err != nil {
+			return fmt.Errorf("multiple result types invalid as %v", err)
+		}
+	}
+
+	resultTypes, err := decodeValueTypes(r, resultCount)
+	if err != nil {
+		return fmt.Errorf("could not read result types: %w", err)
+	}
+
+	ret.Params = paramTypes
+	ret.Results = resultTypes
+
+	// cache the key for the function type
+	_ = ret.String()
+
+	return nil
+}