Use MASM attribute to mark authentication procedure in the authentication component (instead of "auth_" prefix)

[greenhat]

After 0xMiden/protocol#2501 is implemented.

[greenhat]

As a temporary workaround in #995 I'm setting the attribute using the function name matching.

[bobbinth]

The attribute we are using to mark the authentication procedure is @auth_script, I believe.

[greenhat]

The attribute we are using to mark the authentication procedure is @auth_script, I believe.

Thank you!