[JITSI] Create an endpoint to generate a Jitsi URL

Description:

Sometimes we make changes on how the url for Jitsi calls is generated based on settings or something like this. It should be better if instead of check all the settings and generate the url on each client side, we have an endpoint where we send a roomId and it returns a generated Jitsi URL.

Steps to reproduce:

Expected behavior:

Actual behavior:

Server Setup Information:

• Version of Rocket.Chat Server:
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Client Setup Information

• Desktop App or Browser Version:
• Operating System:

Additional context

Relevant logs: