Update signalling_messages.proto

[mehdy]

Relevant components:

• Signalling server
• Common library
• Frontend library
• Frontend UI library
• Matchmaker
• Platform scripts
• SFU

Problem statement:

1. The time field of ping and pong messages needs to be of type int64 to allow for milliseconds (which is how it's done in the implementation).
2. There are a few playerId fields missing from the proto messages that are actually used/sent in the implementation.

Solution

How does this PR solve the problem?

1. Changed the type of time to int64.
2. Added the missing fields.

Documentation

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Or better yet, link to the relevant /Docs update in your PR.

Test Plan and Compatibility

What steps have you taken to ensure this PR maintains compataibility with the existing functionality?

Or better yet, link to the unit tests that accompany this PR.

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