CLAP: Migrate Host State and Timer

[mfisher31]

These extensions are already implemented in plain C. Migrate that to the c++ interface in these callbacks in the Clap provider.

      // clap_host_state
      virtual bool implementsState() const noexcept { return false; }
      virtual void stateMarkDirty() noexcept {}

      // clap_host_timer_support
      virtual bool implementsTimerSupport() const noexcept { return false; }
      virtual bool timerSupportRegisterTimer(uint32_t periodMs, clap_id *timerId) noexcept { return false; }
      virtual bool timerSupportUnregisterTimer(clap_id timerId) noexcept { return false; }