Different level of APK compression (#947)

* Different level of APK compression
- can reduce from 200mb to 50mb with level 5 of compression. Supports Intellij IDEA and command line gradle invocation
- by default, this feature is disabled. To enable create a file local.properties in `apps/android` and paste this line: `compression_level=5`
- level can be from 0 (no compression) to 9 (slowest and the must effective)
- automatically enables `extractNativeLibs` AndroidManifest's flag since it's required in this case. Feel free to find an alternative that works with compression of .so libs and without enabling this flag
- Windows is not suppored, of course. Only Unix-like OSes

* script corrections

* Missing JAVA_HOME in some environments

* Rename release apk made by IDEA to simplex.apk

* Enhancements

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

scripts/android/compress-and-sign-apk.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Fail fast in case any command fails
+set -e
+
+level=$1
+apk_parent_dir=$2
+sdk_dir=$3
+
+store_file=$4
+store_password=$5
+key_alias=$6
+key_password=$7
+
+if [ -z ${7} ]; then echo "You didn't enter all required params:
+compress-and-sign-apk.sh level apk_parent_dir sdk_dir store_file store_password key_alias key_password"
+fi
+
+cd $apk_parent_dir
+
+ORIG_NAME=$(echo app*.apk)
+unzip -o -q -d apk $ORIG_NAME
+
+rm $ORIG_NAME
+
+(cd apk && zip -r -q -$level ../$ORIG_NAME .)
+# Shouldn't be compressed because of Android requirement
+(cd apk && zip -r -q -0 ../$ORIG_NAME resources.arsc)
+#(cd apk && 7z a -r -mx=$level -tzip -x!resources.arsc ../$ORIG_NAME .)
+#(cd apk && 7z a -r -mx=0 -tzip ../$ORIG_NAME resources.arsc)
+
+ALL_TOOLS=($sdk_dir/build-tools/*/)
+BIN_DIR="${ALL_TOOLS[1]}"
+
+$BIN_DIR/zipalign -p -f 4 $ORIG_NAME $ORIG_NAME-2
+
+mv $ORIG_NAME{-2,}
+
+$BIN_DIR/apksigner sign \
+  --ks "$store_file" --ks-key-alias "$key_alias" --ks-pass "pass:$store_password" \
+  --key-pass "pass:$key_password" $ORIG_NAME
+
+# cleanup
+rm -rf apk || true
+rm ${ORIG_NAME}.idsig 2> /dev/null || true