datatables and savingsAccounts data managers migrated to sdk

[danishjamal104]

Description

• Datatable endpoints migrated to sdk
• SavingsAccounts endpoints migrated
• createSavingsAccount, getClientSavingsAccountTemplateByProduct and getGroupSavingsAccountTemplateByProduct, still uses older definition and it works fine. The sdk models doesn't meet the api actual response and request that's why it is left to the older definition.

Every function is tested and put throughout the data validation.

Please make sure these boxes are checked before submitting your pull request - thanks!

• [x] Apply the MifosStyle.xml style template to your code in Android Studio.

• [x] Run the unit tests with ./gradlew check to make sure you didn't break anything

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