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

##### ISSUE TYPE

* Enhancement Request

##### COMPONENT NAME

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UI Enhancement
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##### CLOUDSTACK VERSION

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4.19
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##### 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.

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##### EXPECTED RESULTS

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

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I add many private gateways and Static Routes without knowing its reference that its becoming very hard to maintain.
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Comece pelos fluxos de UI de Private Gateways e Static Routes descritos no issue #8837 e verifique o comportamento atual deles na versão afetada do CloudStack ou no main branch. Rastreie como cada recurso é criado e listado; considera-se concluído quando os usuários puderem inserir descrições para ambos os recursos e visualizá-las ao manter as listas resultantes.

Escrita pelo modelo de indexação a partir do texto da issue.