Expose URLPattern everywhere

I've drafted a set of criteria for which interfaces to expose
universally on all globals, at
w3ctag/design-principles#510.
URLPattern looks like it fits those criteria and is useful to have in
any environment.

Author: ptomato

explainer.md

@@ -404,6 +404,7 @@ Contributions and review provided by:
 * Kenji Baheux
 * L. David Baron
 * Ralph Chelala
+* Philip Chimento
 * Kenneth Rohde Christiansen
 * Victor Costan
 * Domenic Denicola

spec.bs

@@ -183,7 +183,7 @@ It can be constructed using a string for each component, or from a shorthand str
 <xmp class="idl">
 typedef (USVString or URLPatternInit) URLPatternInput;
 
-[Exposed=(Window,Worker)]
+[Exposed=*]
 interface URLPattern {
   constructor(URLPatternInput input, USVString baseURL, optional URLPatternOptions options = {});
   constructor(optional URLPatternInput input = {}, optional URLPatternOptions options = {});