Create a Stimulus controller that allows attaching custom code like so:
```
lang=html
<div data-controller="signed-inline" signed-onclick="/* SIGNATURE=SHA-256:68b329da9893e34099c7d8ad5cb9c940 */ alert('hello')">
</div>
```
The signature is generated server-side with RSA/SHA-256. The stimulus controller should first validate the code, and if it's properly signed, attach the event handler (`onclick` in this example case) with the code wrapped in `eval`.
Checking the signature requires knowledge of the public key used for signing. The key should be expected to be available as base64 in a global variable SIGNED_INLINE_PUBLIC_KEY