feat(rtc): get active call consus intent (audio/video)

[BillCarsonFr]

Depends on: ruma/ruma#2414

Partity with web/js-sdk.
Allows to get the consus intent for the current call using the membership m.call.intent

EW use it to change the icon in the room list

• I've documented the public API Changes in the appropriate CHANGELOG.md files.
• This PR was made with the help of AI.

Signed-off-by:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.89%. Comparing base (109db5e) to head (1c6f1d4).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6274   +/-   ##
=======================================
  Coverage   89.89%   89.89%           
=======================================
  Files         374      374           
  Lines      102275   102358   +83     
  Branches   102275   102358   +83     
=======================================
+ Hits        91942    92019   +77     
- Misses       6776     6779    +3     
- Partials     3557     3560    +3     

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[codspeed-hq]

Merging this PR will improve performance by 68.54%

⚡ 1 improved benchmark
✅ 49 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	Restore session [memory store]	280.6 ms	166.5 ms	+68.54%

---

_{Comparing valere/consensus_call_intent (1c6f1d4) with main (109db5e)}

[Hywan]

Thank you for the contribution and the tests! One note about comments, but nothing huge.

[Hywan]

The documentation is surprising. It says that undefined is returned if members disagree (no consensus). However, the last line seems to be about the returned value, and it says None when there is no consensus.

I think rephrasing is required here. Also, undefined doesn't exist in Rust, you may want to refer to None (if I understand the JavaScript background correctly here).

[BillCarsonFr]

Thx Ivan, indeed I tried to match how js did it, but I don't like it much.
Particularly that a single person out of 10 could decide the consensus.
I will change to return a Full consensus, a Partial consensus (with the number of agreements) and no consensus. Like that it will self document it self.

The UI may use this info or not

pub enum CallIntentConsensus {
    /// All members advertise and agree
    Full(CallIntent),
    /// Some members advertise and agree (intent, agreeing_count, total_count)
    Partial(CallIntent, usize, usize),
    /// No consensus
    None,
}

[Hywan]

I think it's a nice proposal!

[Hywan]

You can use Rust this way:

pub enum CallIntentConsensus {
    /// All members advertise and agree
    Full(CallIntent),
    /// Some members advertise and agree
    Partial {
        intent: CallIntent,
        aggreing_count: usize,
        total_count: usize
    },
    /// No consensus
    None,
}

[Hywan]

Same feedback as the other comment.