fix(urns): pass NID and NSS to base class type parameters

‘URNSpace’ base class methods were using ‘string‘ type by default
which was preventing type inference that would be achieved by
predicate methods like ‘URNSpace.is’.

packages/urns/index.ts

@@ -72,7 +72,7 @@ class TypedComponentsURNSpace<
   RCompType extends CompType = CompType,
   QCompType extends CompType = CompType,
   URNType extends BaseURN<NID, NSS> = BaseURN<NID, NSS>
-> extends URNSpace<string, string, string> {
+> extends URNSpace<NID, NSS, string> {
   constructor(nid: NID, options?: Partial<SpaceOptions<NSS, string>>) {
     super(nid, options)
   }
@@ -100,7 +100,7 @@ class TypedComponentsURNSpace<
   }
 
   componentizedParse(
-    urn: `urn:${string}:${string}${string}`
+    urn: `urn:${NID}:${NSS}${string}`
   ): ParsedComponentizedURN<string, string, RCompType, QCompType> {
     const s = super.parse(urn)
     let rcomps = null
@@ -128,7 +128,7 @@ class TypedComponentsURNSpace<
     return result
   }
 
-  getBaseURN(urn: `urn:${string}:${string}${string}`): URNType {
+  getBaseURN(urn: `urn:${NID}:${NSS}${string}`): URNType {
     const s = super.parse(urn)
     return `urn:${s.nid}:${s.nss}` as URNType
   }