twister: add a hardware map support for using serial pty

The hardware map feature can be used with serial pty mode in
this change. And also add an runner_params option for passing
more parameters from hardware map file to west runner. Note
that you need to create this map file manually because it
cannot be scanned out correctly due to pty is not a physical
HW device existing in system.

And also update doc/develop/test/twister.rst for the usage.

Signed-off-by: Enjia Mai <enjia.mai@intel.com>

scripts/schemas/twister/hwmap-schema.yaml

@@ -27,6 +27,14 @@ sequence:
       "runner":
         type: str
         required: true
+      "runner_params":
+        type: seq
+        required: false
+        sequence:
+          - type: str
+      "serial_pty":
+        type: str
+        required: false
       "serial":
         type: str
         required: false