wgRateLimits: Add configuration option to ignore 'noratelimit' right

wgRateLimits: Add configuration option to ignore 'noratelimit' right

It may be reasonable to ignore the 'noratelimit' right granted to a user
when perfuming some rate limit checks. As an example, a rate limit check
on failed authentication attempts should not be bypassed.

Add an optional '&can-bypass' configuration option for each
$wgRateLimits action that can be set to false to disable checking
User::isPingLimitable(). This bypasses both 'noratelimit' and
$wgRateLimitsExcludedIPs exclusions.

Depends-On: Iacdd1719d5f08eca91de0a35c0042ffee2136f34
Change-Id: Ia3add8bbbab0307f036e9b77e752c382da3a0d04