Adding advanced pattern support to PatternMatcher

This change adds a new pathMatch attribute to the intent-filter tag
that supports a subset of regular expression syntax. Supported
tokens include dot (.) and set ([]) and supported modifiers include
zero-or-more (*), one-or-more(+) and ranges ({}).

Change-Id: I2ec3bc8a9eb3e94d21caf34a1ed0f3fd3fb33a35
Bug: 30805203