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This PR adds support for the `DECREQTPARM` (Request Terminal Parameters) escape sequence, which was originally used on the VT100 terminal to report the serial communication parameters. Modern terminal emulators simply hardcode the reported values for backward compatibility. The `DECREQTPARM` sequence has one parameter, which was originally used to tell the terminal whether it was permitted to send unsolicited reports or not. However, since we have no reason to send an unsolicited report, we don't need to keep track of that state, but the permission parameter does still determine the value of the first parameter in the response. The response parameters are as follows: | Parameter | Value | Meaning | | ---------------- | ------ | ------------------------ | | response type | 2 or 3 | unsolicited or solicited | | parity | 1 | no parity | | data bits | 1 | 8 bits per character | | transmit speed | 128 | 38400 baud | | receive speed | 128 | 38400 baud | | clock multiplier | 1 | | | flags | 0 | | There is some variation in the baud rate reported by modern terminal emulators, and 9600 baud seems to be a little more common than 38400 baud, but I thought the higher speed was probably more appropriate, especially since that's also the value reported by XTerm. ## Validation Steps Performed I've added a couple of adapter and output engine tests to verify that the sequence is dispatched correctly, and the expected responses are generated. I've also manually tested in Vttest and confirmed that we now pass the `DECREQTPARM` test in the _Test of terminal reports_. Closes #7852