[interop] Add Support for Namespaces (#436)

This issue adds support for namespaces, including generating code for namespaces, and performing lookup on namespaces/modules using qualified names, to map such names to actual TS declarations. Only exported declarations from the namespace are generated for, reducing the number of unnecessary declarations generated for.

* wip: TSSyntaxKind for Namespaces

* wip: namespace implementation

* added support for nested namespace gen and filtering

* formatting and analysis fixes

* wip: namespace type resolution

* implemented refactor of type deduction funcs and added support for namespace/module type deduction

* Completed Namespace Refactor

completed namespace type referencing, filtering, id modification and more to ens

ditched the `emitChildren` method due to side effects, in favour of inclusion via the filtering process. Name is kept consistent thanks to parent reference.

* implemented typealias resolution via import equals

* formatting

* complete import typealias support

* namespace import already supported

* removed print statements

* resolved comments and issues

* minor changes/updates

* added new example and resolved deduping of nodes

* updated use of camel_case_type ignore

* comments on updateNSInParent

Author: nikeokoronkwo

web_generator/lib/src/ast/base.dart

@@ -17,8 +17,9 @@ class Options {}
 
 class DeclarationOptions extends Options {
   bool override;
+  bool static;
 
-  DeclarationOptions({this.override = false});
+  DeclarationOptions({this.override = false, this.static = false});
 
   TypeOptions toTypeOptions({bool nullable = false}) =>
       TypeOptions(nullable: nullable);