Fix import with SyntheticDefaultImports enabled

[timokoessler]

In TypeScript you can write import Zen from '@aikidosec/firewall'; instead of import * as Zen from '@aikidosec/firewall'; if allowSyntheticDefaultImports is true.

This is also the case if esModuleInterop is set to true or if moduleResolution is set to bundler. See https://www.typescriptlang.org/tsconfig/#Interop_Constraints_6252 for more information.

But because we don't have a default export, at runtime you will get a crash like this:

import_firewall.default.addHonoMiddleware(app);
                        ^

TypeError: Cannot read properties of undefined (reading 'addHonoMiddleware')

[codecov]

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