Call guest access link creation to join calls as a non registered user via the EC SPA (#12259)

* Add externall call link button if in public call room

Signed-off-by: Timo K <toger5@hotmail.de>

* Allow configuring a spa homeserver url.

Signed-off-by: Timo K <toger5@hotmail.de>

* temp

Signed-off-by: Timo K <toger5@hotmail.de>

* remove homeserver url

Signed-off-by: Timo K <toger5@hotmail.de>

* Add custom title to share dialog.
So that we can use it as a "share call" dialog.

Signed-off-by: Timo K <toger5@hotmail.de>

* - rename config options
- only show link button if a guest url is provided
- share dialog custom Title
- rename call share labels

Signed-off-by: Timo K <toger5@hotmail.de>

* rename to title_link

Signed-off-by: Timo K <toger5@hotmail.de>

* add tests for ShareDialog

Signed-off-by: Timo K <toger5@hotmail.de>

* add tests for share call button

Signed-off-by: Timo K <toger5@hotmail.de>

* review

Signed-off-by: Timo K <toger5@hotmail.de>

* remove comment

Signed-off-by: Timo K <toger5@hotmail.de>

* Update src/components/views/dialogs/ShareDialog.tsx

Co-authored-by: David Baker <dbkr@users.noreply.github.com>

---------

Signed-off-by: Timo K <toger5@hotmail.de>
Co-authored-by: David Baker <dbkr@users.noreply.github.com>

src/IConfigOptions.ts

@@ -119,6 +119,7 @@ export interface IConfigOptions {
     };
     element_call: {
         url?: string;
+        guest_spa_url?: string;
         use_exclusively?: boolean;
         participant_limit?: number;
         brand?: string;