[SMS Plugin] Change android-smsmms to in-house build until upstream supports SDK31

## Summary

Android apps which target SDK 31+ require specifying the mutability of any PENDING_INTENT. This is not supported in the upstream android-smsmms library: https://github.com/klinker41/android-smsmms/pull/193

Until the above PR is merged, we need a solution. I have pulled the code into https://invent.kde.org/sredman/android-smsmms and published the package in the Maven repository in gitlab.

BUG: 464392

## Test Plan

### Before:
Attempting to send an SMS or MMS message using kdeconnect-sms results in no message being sent, and an error being logged:

> V/Sending message: Sending new SMS
> E/Sending message: Exception
>     java.lang.IllegalArgumentException: org.kde.kdeconnect_tp: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
>     Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
>         at android.app.PendingIntent.checkFlags(PendingIntent.java:382)
>         at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:673)
>         at android.app.PendingIntent.getBroadcast(PendingIntent.java:660)
>         at com.klinker.android.send_message.Transaction.sendSmsMessage(Transaction.java:267)
>         at com.klinker.android.send_message.Transaction.sendNewMessage(Transaction.java:158)
>         at com.klinker.android.send_message.Transaction.sendNewMessage(Transaction.java:172)
>         at org.kde.kdeconnect.Plugins.SMSPlugin.SmsMmsUtils.sendMessage(SmsMmsUtils.java:188)
>         at org.kde.kdeconnect.Plugins.SMSPlugin.SMSPlugin.onPacketReceived(SMSPlugin.java:414)
>         at org.kde.kdeconnect.Device.onPacketReceived(Device.java:570)
>         <snipped for brevity>

### After:
SMS and MMS sends normally.

build.gradle

@@ -22,7 +22,7 @@ apply plugin: 'kotlin-android'
 android {
     compileSdkVersion 33
     defaultConfig {
-        minSdkVersion 14
+        minSdkVersion 21
         targetSdkVersion 31
         proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 
@@ -166,7 +166,13 @@ dependencies {
     implementation 'org.atteo.classindex:classindex:3.6'
     annotationProcessor 'org.atteo.classindex:classindex:3.6'
 
-    implementation 'com.klinkerapps:android-smsmms:5.2.6' //For SMS and MMS purposes
+    // The android-smsmms library is the only way I know to handle MMS in Android
+    // (Shouldn't a phone OS make phone things easy?)
+    // This library was originally authored as com.klinkerapps at https://github.com/klinker41/android-smsmms.
+    // However, that version is under-loved. I have therefore made "some fixes" and published it.
+    // Please see https://invent.kde.org/sredman/android-smsmms/-/tree/master
+    implementation 'org.kde:android-smsmms:5.2.7'
+    implementation 'com.klinkerapps:logger:1.0.3'
 
     implementation 'commons-io:commons-io:2.8.0' // newer versions don't work on Android 7: https://stackoverflow.com/questions/73604534/no-static-method-threadlocal-withinitial-commons-io-dependency
     implementation 'org.apache.commons:commons-collections4:4.4'

settings.gradle

@@ -15,6 +15,12 @@ dependencyResolutionManagement {
     repositories {
         google()
         mavenCentral()
+        maven {
+            name = "KDE Invent Maven"
+            // This project_id corresponds to kdeconnect-android project
+            // Depending on how long we need this custom package, we may decide to move it to a more-official repo
+            url = "https://invent.kde.org/api/v4/projects/72/packages/maven"
+        }
     }
 }
 rootProject.name = "kdeconnect-android"