Introduce support for new VM based minicap to support Android 12

This commit introduce a new option to use a new minicap
implementation by specifying --screen-grabber or the env
variable SCREEN_GRABBER. The current native minicap is the default
and is refered as 'minicap-bin'. The new minicap which is packaged
in an apk is usable with 'minicap-apk' and will be used as a
fallback.
At the moment, this apk is expected to be included in
minicap-prebuilt node package at this location
minicap-prebuilt/prebuilt/noarch/minicap.apk.

STFService.apk has also been updated to take into account Android 12

Signed-off-by: Crepieux Pierre <pierre.crepieux@orange.com>

lib/cli/provider/index.js

@@ -116,6 +116,12 @@ module.exports.builder = function(yargs) {
     , type: 'number'
     , default: process.env.SCREEN_JPEG_QUALITY || 80
     })
+    .option('screen-grabber', {
+      describe: 'The tool to be used for screen capture. '+
+        'Value must be either: minicap-bin (default) or minicap-apk'
+    , type: 'string'
+    , default: process.env.SCREEN_GRABBER || 'minicap-bin'
+    })
     .option('screen-ping-interval', {
       describe: 'The interval at which to send ping messages to keep the ' +
         'screen WebSocket alive.'