Combine inherited nonparam Security() objects

[kristjanvalur]

A simplified version of the rejected #5433 , this one combines the list of inherited "nonparam" dependencies. Multiple instances of a Security dependency are combined, their scopes joined into a single scope list.

This serves two purposes:

1. In case there are many different scope checks set up, combine the invokation into one dependency call for efficiency.
2. Allow a security dependency to interpret the combined list of scopes, for example, adding semantics where specially marked scopes can disable a previously added scope.

Example:

def my_security(scopes: SecurityScopes):
    active = set()
    for scope in scopes.scopes:
        if not scope.startswith("-"):
            active.add(scope)
        else:
            active.discard(scope[1:])
    apply_scopes(sorted(active))

see also #5622 which proposes to join nonparam dependencies with parameter dependencies in a similar manner.

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