User Experience: Allow users to add Description to Private Gateway and Static Routes

##### ISSUE TYPE

* Enhancement Request

##### COMPONENT NAME

~~~
UI Enhancement
~~~

##### CLOUDSTACK VERSION

~~~
4.19
~~~

##### CONFIGURATION

##### OS / ENVIRONMENT

N/A

##### SUMMARY

##### STEPS TO REPRODUCE

Currently, the Cloudstack UI doesnt support users to add descriptions/notes to their created Private Gateways and Static Routes

I propose adding descriptions To Private Gateways and Static Routes because as the number of gateways grows, i lose track of what each gateway was for, which makes it hard to maintain. And a Private Gateway can have many static routes, which are very hard to keep track too.

I see a large list, but i have no idea what each one is for. It becomes even worse if i have a colleague who adds another gateway and i have no i wont be able to identify (cause the list is so long) or understand what the item was created for.

I think this feature is one of those that are low hanging fruits that would greatly improve the users experience.

~~~

~~~

##### EXPECTED RESULTS

~~~
To be able to add descriptions to Private Gateways and Static Routes so its easier to maintain in the long term.
~~~

##### ACTUAL RESULTS

~~~
I add many private gateways and Static Routes without knowing its reference that its becoming very hard to maintain.
~~~

Beginne mit den in Issue #8837 beschriebenen UI-Abläufen für Private Gateways und Static Routes und überprüfe ihr aktuelles Verhalten in der betroffenen CloudStack-Version oder im main branch. Verfolge, wie jede Ressource erstellt und aufgelistet wird; erledigt ist die Aufgabe, wenn Benutzer Beschreibungen für beide Ressourcen eingeben und sie bei der Pflege der daraus resultierenden Listen sehen können.

Vom Indexierungsmodell aus dem Issue-Text verfasst.