[diag] add power calibration related diag commands (#8584)

he power calibration is supported by OT, this commit adds diag
commands that are used to measure the mapping between the actual power
and raw power settings, show the platform used power settings table.
1. Add "diag powersettings" to show the platform currently used power
   settings table.
2. Add "diag rawpowersetting" to make the platform to use the given
   raw power settings to transmit frames.
3. Add "diag cw" to transmit the continuous carrier wave.

tests/scripts/expect/cli-diags.exp

@@ -175,6 +175,25 @@ send "diag gpio mode 0\n"
 expect "out"
 expect_line "Done"
 
+send "diag cw start\n"
+expect_line "Done"
+
+send "diag cw stop\n"
+expect_line "Done"
+
+send "diag rawpowersetting 112233\n"
+expect_line "Done"
+
+send "diag rawpowersetting\n"
+expect "112233"
+expect_line "Done"
+
+send "diag rawpowersetting enable\n"
+expect_line "Done"
+
+send "diag rawpowersetting disable\n"
+expect_line "Done"
+
 send "diag invalid_commad\n"
 expect "Error 35: InvalidCommand"
 

tests/scripts/expect/posix-power-calibration.exp

@@ -0,0 +1,74 @@
+#!/usr/bin/expect -f
+#
+#  Copyright (c) 2022, The OpenThread Authors.
+#  All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions are met:
+#  1. Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#  2. Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#  3. Neither the name of the copyright holder nor the
+#     names of its contributors may be used to endorse or promote products
+#     derived from this software without specific prior written permission.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+#  POSSIBILITY OF SUCH DAMAGE.
+#
+
+source "tests/scripts/expect/_common.exp"
+
+spawn_node 1
+
+send "diag start\n"
+expect "start diagnostics mode"
+expect "status 0x00"
+expect_line "Done"
+
+send "diag powersettings 11\n"
+expect "failed"
+expect "status 0x17"
+expect_line "Error 23: NotFound"
+
+send "diag powersettings\n"
+expect "| StartCh | EndCh | TargetPower | ActualPower | RawPowerSetting |"
+expect "+---------+-------+-------------+-------------+-----------------+"
+expect_line "Done"
+
+send "diag stop\n"
+expect_line "Done"
+
+send "region US\n"
+expect_line "Done"
+
+send "diag start\n"
+expect "start diagnostics mode"
+expect "status 0x00"
+expect_line "Done"
+
+send "diag powersettings 11\n"
+expect -re {TargetPower\(0\.01dBm\): -?\d+}
+expect -re {ActualPower\(0\.01dBm\): -?\d+}
+expect -re {RawPowerSetting: [0-9]{1,16}}
+expect_line "Done"
+
+send "diag powersettings\n"
+expect "| StartCh | EndCh | TargetPower | ActualPower | RawPowerSetting |"
+expect "+---------+-------+-------------+-------------+-----------------+"
+for {set i 1} {$i <= 4} {incr i} {
+    expect -re "\\| +\\d+ | +\\d+ | +\\d+ | +\\d+ | +\[0-9\]\{1,16\} |"
+}
+expect_line "Done"
+
+dispose_all