week-2 bloc setup

[4555jan]

Addressed Issues:
Fixes #52
Screenshots/Recordings:
No UI changes — this PR adds Bloc/Cubit state management layer only.
Additional Notes:
This PR sets up the Bloc architecture for the Zplit app, including:

Bloc, Event, and State classes for Balance, Group, Transaction, and User features
Repository layer for Balance, Group, Transaction, and User
Builds on top of the Drift database setup from the Week 1 PR

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[4555jan]

i had to do this because some version issues comming in bloc_test

[M4dhav]

Use the folder architecture suggested by the Flutter team in the App Architecture Case study

[4555jan]

h how about this it is closer to what they are suggesting ? @M4dhav