ASC: Consider renaming match method "oidc"

[Daniel Fett]

Suggested by @Joseph Heenan

It could be named “simple” to avoid the impression that using it re-enables functionality for value/`values` in the claims.

Also, it is really simple.

[Mark Haine]

I support the rename idea as it is not very informative and it also overlaps with the TC transformation function “match”

would “method” be a viable alternative?

[Mark Haine]

Resolved by PR #197