Add validation TOO_SHORT_WHEN_ALL_NUMERIC

To distinguish the requirement between all numeric and not all numeric
when COMPLEXITY_HIGH.

Note:
The second param of applyComplexity() changed back from
withNonNumericCharacters to isPin.
This was changed from isPin to withNonNumericCharacters in Change
I3227d4d8e6825b5c4ea525828d7e09f52702065b without changing the caller.
This currently not causing any issues because applyComplexity() only
used by KeyguardManager.getMinLockLength(), which currently never be
called with COMPLEXITY_HIGH.

Fix: 227149118
Fix: 173167839
Test: manual & robolectric
Change-Id: I7e0d4a1edf42327452b7d9a564258b26865c056e