fix(common): allow number or boolean as http params (#40663)

This change fixes an incompatibility between the old `@angular/http` package
and its successor (`@angular/common/http`) by re-introducing the types that were supported before.

It now allows to use number and boolean directly as HTTP params, instead of having to convert it to string first.

Before:

    this.http.get('/api/config', { params: { page: `${page}` } });

After:

    this.http.get('/api/config', { params: { page }});

`HttpParams` has also been updated to have most of its methods accept number or boolean values.

Fixes #23856

BREAKING CHANGE:

The methods of the `HttpParams` class now accept `string | number | boolean`
instead of `string` for the value of a parameter.
If you extended this class in your application,
you'll have to update the signatures of your methods to reflect these changes.

PR Close #40663

aio/content/guide/http.md

@@ -72,7 +72,7 @@ The `get()` method takes two arguments; the endpoint URL from which to fetch, an
 options: {
     headers?: HttpHeaders | {[header: string]: string | string[]},
     observe?: 'body' | 'events' | 'response',
-    params?: HttpParams|{[param: string]: string | string[]},
+    params?: HttpParams|{[param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>},
     reportProgress?: boolean,
     responseType?: 'arraybuffer'|'blob'|'json'|'text',
     withCredentials?: boolean,