Patch Changes

• Add Job.created_at, JobState.accepted_at, JobState.assigned_at and AgentDispatchState.trigger, and the lk.rtc.joinRequestTime participant attribute - #1929 (@boks1971)

• Add UpdateJobStatus.join_timing, the instants of an agent join on the worker's monotonic clock - #1900 (@boks1971)

• agentsobs and agentsv3obs report agent join latency per job: the user arrival time, the join outcome, whether the join counts toward the latency figures, the attempts, and the total and attributable latency - #1927 (@boks1971)

• Replace NodeStats.forward_scheduling_delay with NodeStats.forward_processing_per_write, the mean forwarding work per write to a subscriber - #1895 (@boks1971)

• webhook: ResourceURLNotifier.Stop(false) waits for queued events to be sent, as URLNotifier.Stop(false) does - #1901 (@mnjalale)

• sdp: add CodecsFromSessionDescription and ParseFmtp helpers - #1899 (@anunaym14)

• agent_simulation: dial a phone number over SIP instead of dispatching an agent - #1858 (@u9g)

• Add SIPDialtone to select a regional dial tone on CreateSIPParticipant and TransferSIPParticipant; deprecate play_dialtone - #1892 (@dennwc)

• sip: add SIPMediaConfig.drop_audio_during_dtmf to stop sending audio RTP while DTMF is sent - #1907 (@alexlivekit)

• Add lk.sip.pinEnteredTime and lk.sip.answerTime SIP participant attributes, with helpers to set and parse them - #1928 (@boks1971)

• SIP authentication: compare IP masks against remote address rather than From header. - #1889 (@alexfish8)