Fix sync related crash on init and balance screen

[notmandatory]

• update build.gradle dependencies to latest versions (this is unrelated to the fix)
• combine fragment view models into single WalletViewModel and update related fragments

Still TODO in new PRs

1. fix crash in withdraw fragment Fix crash in withdraw fragment #16
2. update withdraw fragement to use WalletViewModel and coroutine flows
3. isolate root some sort of race condition related error in bdk-jni project related to sync and balance calls Possible race condition related error related to sync and balance calls bdk-jni#15
4. remove or re-enable progress bars from balance fragment Remove or re-enable BalanceFragment progress bars #17

[notmandatory]

I just updated the notmandatory/bdk-jni keys branch, you should update to the latest in this branch and do ./gradlew publishToMavenLocal